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Assessment","zbt-z8102ax-5g-openwrt-router-review-dual-sim-rm500u-ea-and-an-honest-assessment","{\"time\":1780000000000,\"blocks\":[{\"id\":\"zbt-title\",\"data\":{\"text\":\"ZBT Z8102AX 5G OpenWrt Router Review: Dual SIM, RM500U-EA and an Honest Assessment\",\"level\":1},\"type\":\"header\"},{\"id\":\"zbt-intro-1\",\"data\":{\"text\":\"The ZBT Z8102AX is not a typical consumer router. It is a 5G OpenWrt-based networking platform with a Quectel RM500U-EA modem, dual-SIM hardware, multiple Ethernet ports and a vendor-modified OpenWrt 21.02 firmware. After several days of testing, the unit has worked successfully and remained stable enough for practical use.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-intro-2\",\"data\":{\"text\":\"This article is the first part of a small router test series on stajic.de. The goal is not to romanticize the device, but to document what it can do, where it is strong, where it is weak, and whether a router like this can become a serious OpenWrt-based prosumer device for advanced users, mobile office setups, homelabs and 5G failover scenarios.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-series-heading\",\"data\":{\"text\":\"Planned Article Series\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-series-text\",\"data\":{\"text\":\"This review is planned as the entry point for a small series of detailed articles. The following pages will go deeper into firmware, modem behavior, dual-SIM handling, hardware quality, packaging and the next step toward a stronger Wi-Fi 7 OpenWrt router.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-series-list\",\"data\":{\"items\":[\"ZBT Z8102AX OpenWrt 21.02 Firmware Review: Vendor Build, Limits and Upgrade Questions — \u002Fblog\u002Fzbt-z8102ax-openwrt-2102-firmware-review\",\"ZBT Z8102AX RM500U-EA Modem Test: 5G Bands, Signal Quality and Mobile Network Behavior — \u002Fblog\u002Fzbt-z8102ax-rm500u-ea-5g-modem-test\",\"ZBT Z8102AX Dual-SIM and Failover: What Works, What Is Missing and What Needs Better Firmware — \u002Fblog\u002Fzbt-z8102ax-dual-sim-failover-test\",\"ZBT Z8102AX Hardware and Packaging Review: Ports, Case, Antennas and First Physical Impressions — \u002Fblog\u002Fzbt-z8102ax-hardware-packaging-review\",\"Next Step: Wi-Fi 7, Stronger CPU and a Better OpenWrt 5G Router Configuration — \u002Fblog\u002Fwifi7-openwrt-5g-router-next-step\"],\"style\":\"unordered\"},\"type\":\"list\"},{\"id\":\"zbt-tech-heading\",\"data\":{\"text\":\"Technical Foundation\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-tech-text-1\",\"data\":{\"text\":\"The tested unit is identified in the interface as ZBT-Z8102AX-2SIM. It runs a manufacturer-specific OpenWrt 21.02 build with kernel 5.4.246 and uses the Quectel RM500U-EA as its 4G and 5G modem. The device is based on a MediaTek Filogic platform and belongs to the Z8102AX router family.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-tech-list\",\"data\":{\"items\":[\"Model shown by firmware: ZBT-Z8102AX-2SIM\",\"Firmware: OpenWrt 21.02 vendor build\",\"Kernel: 5.4.246\",\"Modem: Quectel RM500U-EA\",\"SIM status: ready\",\"Observed operator during test: o2 Germany\",\"Observed connection: LTE Band 3 with NR n28\",\"Test status: successfully running and stable so far\"],\"style\":\"unordered\"},\"type\":\"list\"},{\"id\":\"zbt-arrival-heading\",\"data\":{\"text\":\"Arrival and First Test Period\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-arrival-text-1\",\"data\":{\"text\":\"The router arrived on 27 May 2026 and has been tested until 16 June 2026. During this first test period, the router worked successfully and remained stable enough for practical use. The uptime reached several days without a critical failure, which is a positive first signal for a sample device in this class.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-arrival-text-2\",\"data\":{\"text\":\"The first impression is not perfect, but it is clearly useful. The router is not a polished mainstream product, but it is also not a toy. It is a serious enough 5G OpenWrt platform to continue testing.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-packaging-heading\",\"data\":{\"text\":\"Packaging: The First Weak Point\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-packaging-text-1\",\"data\":{\"text\":\"The biggest negative surprise was the packaging. Unfortunately, the cardboard box was weak and too soft for a device of this weight and shape. The router itself does not even have sharp edges, but it still managed to push through the inner cardboard form and damage it easily.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-packaging-text-2\",\"data\":{\"text\":\"Fortunately, the device was shipped in double packaging, so the router itself arrived safely. Still, this is an important point: a technically good device deserves better packaging, especially if it is ever meant to be sold professionally in Europe.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-firmware-heading\",\"data\":{\"text\":\"Can a Product with OpenWrt 21 Still Be Bought Today?\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-firmware-text-1\",\"data\":{\"text\":\"This is one of the central questions. OpenWrt 21.02 is old, and the tested firmware is not a clean upstream OpenWrt release, but a vendor-specific build. That does not automatically make the router bad. In fact, the current vendor firmware is functional and stable enough for testing. 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For a professional product or larger deployment, it is only acceptable if the firmware path is clear: recovery image, upgrade method, modem support, dual-SIM GPIO handling and stable rollback must be verified.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-firmware-text-3\",\"data\":{\"text\":\"The next tests will therefore focus on other firmware options, modem diagnostics, SIM failover, band locking and whether a more modern OpenWrt-based system can improve the device without breaking its 5G and dual-SIM functionality.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-strengths-heading\",\"data\":{\"text\":\"What Makes the Router Interesting\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-strengths-text\",\"data\":{\"text\":\"The ZBT Z8102AX is interesting because it sits between consumer routers and industrial devices. It is not as polished as a premium consumer router, but it is more open, more flexible and more technically interesting than many closed 5G routers on the market.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-strengths-list\",\"data\":{\"items\":[\"5G modem with RM500U-EA\",\"Dual-SIM hardware\",\"OpenWrt-based system\",\"Multiple Ethernet ports\",\"Useful for mobile internet, failover and homelab scenarios\",\"Better suited for advanced users than beginners\"],\"style\":\"unordered\"},\"type\":\"list\"},{\"id\":\"zbt-market-heading\",\"data\":{\"text\":\"Market Price and Positioning\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-market-text-1\",\"data\":{\"text\":\"A router like this should not be positioned as a cheap plastic 5G box. With OpenWrt, a real 5G modem, dual-SIM hardware and multiple Ethernet ports, the realistic market value can move into the 300 to 400 EUR range, depending on firmware quality, documentation, packaging, warranty and support.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-market-text-2\",\"data\":{\"text\":\"At the same time, this market will probably become more aggressive. It is only a matter of time before similar devices appear in larger numbers and sellers start reducing prices. But that does not automatically mean better value. In this kind of hardware, cheaper can easily become more expensive if quality, packaging, firmware, recovery and modem stability are weak.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-config-heading\",\"data\":{\"text\":\"Selected Configuration and Next Hardware Step\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-config-text-1\",\"data\":{\"text\":\"This test unit was selected in a specific configuration with the RM500U-EA modem and dual-SIM hardware. The next step will not be the same class of router again, but a stronger Wi-Fi 7 device with a more powerful four-core platform. The goal is to compare this first sample with a newer generation device and hopefully build a better configuration next time.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-config-text-2\",\"data\":{\"text\":\"A more stable pricing policy, a cleaner firmware path and better packaging would be essential if such a device should ever become part of a serious product strategy. The first sample is useful as a learning device. The second sample should be closer to the future direction: Wi-Fi 7, stronger CPU, better I\u002FO and a more mature OpenWrt setup.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-conclusion-heading\",\"data\":{\"text\":\"Conclusion\",\"level\":2},\"type\":\"header\"},{\"id\":\"zbt-conclusion-text-1\",\"data\":{\"text\":\"The ZBT Z8102AX is not perfect, but it is a good and interesting piece of hardware. It has worked successfully and relatively stable in the first test period. The device proves that this class of 5G OpenWrt router has real potential, especially for advanced users, mobile network setups and failover scenarios.\"},\"type\":\"paragraph\"},{\"id\":\"zbt-conclusion-text-2\",\"data\":{\"text\":\"The weak packaging, old vendor firmware and unclear long-term upgrade path prevent it from being a finished premium product. But as a first sample, it is valuable. The next articles will go deeper into firmware, modem behavior, SIM failover, signal quality and whether a stronger Wi-Fi 7 OpenWrt router can become the better long-term direction.\"},\"type\":\"paragraph\"}],\"version\":\"2.30.8\"}",{"time":236,"blocks":237,"version":384},1780000000000,[238,241,246,250,255,259,270,274,278,290,294,298,302,306,310,314,318,322,326,330,334,338,348,352,356,360,364,368,372,376,380],{"id":239,"data":240,"type":42},"zbt-title",{"text":232,"level":40},{"id":242,"data":243,"type":245},"zbt-intro-1",{"text":244},"The ZBT Z8102AX is not a typical consumer router. It is a 5G OpenWrt-based networking platform with a Quectel RM500U-EA modem, dual-SIM hardware, multiple Ethernet ports and a vendor-modified OpenWrt 21.02 firmware. 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The following pages will go deeper into firmware, modem behavior, dual-SIM handling, hardware quality, packaging and the next step toward a stronger Wi-Fi 7 OpenWrt router.",{"id":260,"data":261,"type":269},"zbt-series-list",{"items":262,"style":268},[263,264,265,266,267],"ZBT Z8102AX OpenWrt 21.02 Firmware Review: Vendor Build, Limits and Upgrade Questions — \u002Fblog\u002Fzbt-z8102ax-openwrt-2102-firmware-review","ZBT Z8102AX RM500U-EA Modem Test: 5G Bands, Signal Quality and Mobile Network Behavior — \u002Fblog\u002Fzbt-z8102ax-rm500u-ea-5g-modem-test","ZBT Z8102AX Dual-SIM and Failover: What Works, What Is Missing and What Needs Better Firmware — \u002Fblog\u002Fzbt-z8102ax-dual-sim-failover-test","ZBT Z8102AX Hardware and Packaging Review: Ports, Case, Antennas and First Physical Impressions — \u002Fblog\u002Fzbt-z8102ax-hardware-packaging-review","Next Step: Wi-Fi 7, Stronger CPU and a Better OpenWrt 5G Router Configuration — \u002Fblog\u002Fwifi7-openwrt-5g-router-next-step","unordered","list",{"id":271,"data":272,"type":42},"zbt-tech-heading",{"text":273,"level":254},"Technical Foundation",{"id":275,"data":276,"type":245},"zbt-tech-text-1",{"text":277},"The tested unit is identified in the interface as ZBT-Z8102AX-2SIM. It runs a manufacturer-specific OpenWrt 21.02 build with kernel 5.4.246 and uses the Quectel RM500U-EA as its 4G and 5G modem. The device is based on a MediaTek Filogic platform and belongs to the Z8102AX router family.",{"id":279,"data":280,"type":269},"zbt-tech-list",{"items":281,"style":268},[282,283,284,285,286,287,288,289],"Model shown by firmware: ZBT-Z8102AX-2SIM","Firmware: OpenWrt 21.02 vendor build","Kernel: 5.4.246","Modem: Quectel RM500U-EA","SIM status: ready","Observed operator during test: o2 Germany","Observed connection: LTE Band 3 with NR n28","Test status: successfully running and stable so far",{"id":291,"data":292,"type":42},"zbt-arrival-heading",{"text":293,"level":254},"Arrival and First Test Period",{"id":295,"data":296,"type":245},"zbt-arrival-text-1",{"text":297},"The router arrived on 27 May 2026 and has been tested until 16 June 2026. During this first test period, the router worked successfully and remained stable enough for practical use. The uptime reached several days without a critical failure, which is a positive first signal for a sample device in this class.",{"id":299,"data":300,"type":245},"zbt-arrival-text-2",{"text":301},"The first impression is not perfect, but it is clearly useful. The router is not a polished mainstream product, but it is also not a toy. It is a serious enough 5G OpenWrt platform to continue testing.",{"id":303,"data":304,"type":42},"zbt-packaging-heading",{"text":305,"level":254},"Packaging: The First Weak Point",{"id":307,"data":308,"type":245},"zbt-packaging-text-1",{"text":309},"The biggest negative surprise was the packaging. Unfortunately, the cardboard box was weak and too soft for a device of this weight and shape. The router itself does not even have sharp edges, but it still managed to push through the inner cardboard form and damage it easily.",{"id":311,"data":312,"type":245},"zbt-packaging-text-2",{"text":313},"Fortunately, the device was shipped in double packaging, so the router itself arrived safely. Still, this is an important point: a technically good device deserves better packaging, especially if it is ever meant to be sold professionally in Europe.",{"id":315,"data":316,"type":42},"zbt-firmware-heading",{"text":317,"level":254},"Can a Product with OpenWrt 21 Still Be Bought Today?",{"id":319,"data":320,"type":245},"zbt-firmware-text-1",{"text":321},"This is one of the central questions. OpenWrt 21.02 is old, and the tested firmware is not a clean upstream OpenWrt release, but a vendor-specific build. That does not automatically make the router bad. In fact, the current vendor firmware is functional and stable enough for testing. But it does raise questions about security updates, long-term maintainability, modem management and future upgrade paths.",{"id":323,"data":324,"type":245},"zbt-firmware-text-2",{"text":325},"For a private test device, OpenWrt 21 can be acceptable if the system works, the modem is stable and the device is not exposed carelessly. For a professional product or larger deployment, it is only acceptable if the firmware path is clear: recovery image, upgrade method, modem support, dual-SIM GPIO handling and stable rollback must be verified.",{"id":327,"data":328,"type":245},"zbt-firmware-text-3",{"text":329},"The next tests will therefore focus on other firmware options, modem diagnostics, SIM failover, band locking and whether a more modern OpenWrt-based system can improve the device without breaking its 5G and dual-SIM functionality.",{"id":331,"data":332,"type":42},"zbt-strengths-heading",{"text":333,"level":254},"What Makes the Router Interesting",{"id":335,"data":336,"type":245},"zbt-strengths-text",{"text":337},"The ZBT Z8102AX is interesting because it sits between consumer routers and industrial devices. It is not as polished as a premium consumer router, but it is more open, more flexible and more technically interesting than many closed 5G routers on the market.",{"id":339,"data":340,"type":269},"zbt-strengths-list",{"items":341,"style":268},[342,343,344,345,346,347],"5G modem with RM500U-EA","Dual-SIM hardware","OpenWrt-based system","Multiple Ethernet ports","Useful for mobile internet, failover and homelab scenarios","Better suited for advanced users than beginners",{"id":349,"data":350,"type":42},"zbt-market-heading",{"text":351,"level":254},"Market Price and Positioning",{"id":353,"data":354,"type":245},"zbt-market-text-1",{"text":355},"A router like this should not be positioned as a cheap plastic 5G box. With OpenWrt, a real 5G modem, dual-SIM hardware and multiple Ethernet ports, the realistic market value can move into the 300 to 400 EUR range, depending on firmware quality, documentation, packaging, warranty and support.",{"id":357,"data":358,"type":245},"zbt-market-text-2",{"text":359},"At the same time, this market will probably become more aggressive. It is only a matter of time before similar devices appear in larger numbers and sellers start reducing prices. But that does not automatically mean better value. In this kind of hardware, cheaper can easily become more expensive if quality, packaging, firmware, recovery and modem stability are weak.",{"id":361,"data":362,"type":42},"zbt-config-heading",{"text":363,"level":254},"Selected Configuration and Next Hardware Step",{"id":365,"data":366,"type":245},"zbt-config-text-1",{"text":367},"This test unit was selected in a specific configuration with the RM500U-EA modem and dual-SIM hardware. The next step will not be the same class of router again, but a stronger Wi-Fi 7 device with a more powerful four-core platform. The goal is to compare this first sample with a newer generation device and hopefully build a better configuration next time.",{"id":369,"data":370,"type":245},"zbt-config-text-2",{"text":371},"A more stable pricing policy, a cleaner firmware path and better packaging would be essential if such a device should ever become part of a serious product strategy. The first sample is useful as a learning device. The second sample should be closer to the future direction: Wi-Fi 7, stronger CPU, better I\u002FO and a more mature OpenWrt setup.",{"id":373,"data":374,"type":42},"zbt-conclusion-heading",{"text":375,"level":254},"Conclusion",{"id":377,"data":378,"type":245},"zbt-conclusion-text-1",{"text":379},"The ZBT Z8102AX is not perfect, but it is a good and interesting piece of hardware. It has worked successfully and relatively stable in the first test period. The device proves that this class of 5G OpenWrt router has real potential, especially for advanced users, mobile network setups and failover scenarios.",{"id":381,"data":382,"type":245},"zbt-conclusion-text-2",{"text":383},"The weak packaging, old vendor firmware and unclear long-term upgrade path prevent it from being a finished premium product. But as a first sample, it is valuable. The next articles will go deeper into firmware, modem behavior, SIM failover, signal quality and whether a stronger Wi-Fi 7 OpenWrt router can become the better long-term direction.","2.30.8","The ZBT Z8102AX is an unusual 5G router with an OpenWrt base, a dual-SIM concept, and a Quectel RM500U-EA modem. In testing, it shows clear strengths in flexibility, interfaces, and mobile connectivity, but also the typical weaknesses of a vendor-modified OpenWrt build.","\u002Fuploads\u002F2026\u002F06\u002Fopenwrt-router-review-dual-sim-01-1781620588908-fwmzj7.webp","openwrt-router-review-dual-sim-01-1781620588908-fwmzj7","PUBLISHED","2026-06-16T07:34:00.000Z","2026-06-16T13:34:22.870Z","2026-06-16T14:37:01.181Z",[393,396,399],{"id":131,"name":394,"slug":395},"Router","router",{"id":146,"name":397,"slug":398},"Network","network",{"id":77,"name":400,"slug":401},"Hardware","hardware",{"id":403,"login":404,"email":405,"displayName":406},"20","rooth8233","aleksandar@stajic.de","Aleksandar Stajić",[408],{"lang":7,"title":232,"content":234,"contentJson":409,"excerpt":385},{"time":236,"blocks":410,"version":384},[411,413,415,417,419,421,424,426,428,431,433,435,437,439,441,443,445,447,449,451,453,455,458,460,462,464,466,468,470,472,474],{"id":239,"data":412,"type":42},{"text":232,"level":40},{"id":242,"data":414,"type":245},{"text":244},{"id":247,"data":416,"type":245},{"text":249},{"id":251,"data":418,"type":42},{"text":253,"level":254},{"id":256,"data":420,"type":245},{"text":258},{"id":260,"data":422,"type":269},{"items":423,"style":268},[263,264,265,266,267],{"id":271,"data":425,"type":42},{"text":273,"level":254},{"id":275,"data":427,"type":245},{"text":277},{"id":279,"data":429,"type":269},{"items":430,"style":268},[282,283,284,285,286,287,288,289],{"id":291,"data":432,"type":42},{"text":293,"level":254},{"id":295,"data":434,"type":245},{"text":297},{"id":299,"data":436,"type":245},{"text":301},{"id":303,"data":438,"type":42},{"text":305,"level":254},{"id":307,"data":440,"type":245},{"text":309},{"id":311,"data":442,"type":245},{"text":313},{"id":315,"data":444,"type":42},{"text":317,"level":254},{"id":319,"data":446,"type":245},{"text":321},{"id":323,"data":448,"type":245},{"text":325},{"id":327,"data":450,"type":245},{"text":329},{"id":331,"data":452,"type":42},{"text":333,"level":254},{"id":335,"data":454,"type":245},{"text":337},{"id":339,"data":456,"type":269},{"items":457,"style":268},[342,343,344,345,346,347],{"id":349,"data":459,"type":42},{"text":351,"level":254},{"id":353,"data":461,"type":245},{"text":355},{"id":357,"data":463,"type":245},{"text":359},{"id":361,"data":465,"type":42},{"text":363,"level":254},{"id":365,"data":467,"type":245},{"text":367},{"id":369,"data":469,"type":245},{"text":371},{"id":373,"data":471,"type":42},{"text":375,"level":254},{"id":377,"data":473,"type":245},{"text":379},{"id":381,"data":475,"type":245},{"text":383},"Post erfolgreich abgerufen",{"items":478,"source":519,"manualIds":520,"manualMatchedIds":521},[479,485,492,499,506,512],{"id":480,"slug":481,"title":482,"excerpt":483,"featuredImage":386,"publishedAt":484},"458","wifi7-openwrt-5g-router-next-step","The Next OpenWrt 5G Router: Why Wi-Fi 7, a Stronger CPU and Better Firmware Matter","The ZBT Z8102AX is a useful first sample, but the next step should be stronger: Wi-Fi 7, a more powerful four-core platform, better firmware clarity, improved packaging and a more stable pricing policy. The goal is not just another 5G router, but a better configured OpenWrt-based prosumer device.","2026-06-16T10:41:00.000Z",{"id":486,"slug":487,"title":488,"excerpt":489,"featuredImage":490,"publishedAt":491},"455","zbt-z8102ax-dual-sim-failover-test","ZBT Z8102AX Dual-SIM Failover: What Works, What Is Missing and What Needs Better Firmware","The ZBT Z8102AX is a dual-SIM 5G OpenWrt router, but dual-SIM hardware alone is not the same as intelligent failover. The router recognizes the SIM and connects successfully, but automatic switching, modem recovery, signal-based decisions and clean failover logic still need deeper testing.","\u002Fuploads\u002F2026\u002F06\u002Fopenwrt-router-review-dual-sim-03-1781620592829-7t77j7.webp","2026-06-16T10:40:00.000Z",{"id":493,"slug":494,"title":495,"excerpt":496,"featuredImage":497,"publishedAt":498},"456","zbt-z8102ax-hardware-packaging-review","ZBT Z8102AX Hardware and Packaging Review: Strong Router, Weak Box","The ZBT Z8102AX makes a solid first impression as a slim black metal 5G OpenWrt router with multiple antenna connectors, dual-SIM slots, USB, LAN\u002FWAN ports and a practical accessory set. The hardware feels useful and serious, but the packaging is clearly the weak point.","\u002Fuploads\u002F2026\u002F06\u002Fopenwrt-router-review-dual-sim-02-1781620590938-y33j4b.webp","2026-06-16T04:40:00.000Z",{"id":500,"slug":501,"title":502,"excerpt":503,"featuredImage":504,"publishedAt":505},"453","zbt-z8102ax-openwrt-2102-firmware-review","ZBT Z8102AX OpenWrt 21.02 Firmware Review: Stable Enough, but Is It Future-Proof?","The ZBT Z8102AX runs a vendor-modified OpenWrt 21.02 build with kernel 5.4.246. In practical testing, the firmware worked successfully and kept the router stable for several days, but the old base raises important questions about security, modem control, upgrade paths and long-term maintainability.","\u002Fuploads\u002F2026\u002F06\u002Fopenwrt-router-review-dual-sim-04-1781620594653-uvf5oy.webp","2026-06-16T10:39:00.000Z",{"id":507,"slug":508,"title":509,"excerpt":510,"featuredImage":511,"publishedAt":484},"457","should-you-buy-5g-openwrt-router-old-firmware","Should You Buy a 5G OpenWrt Router with Old Firmware? ZBT Z8102AX as a Practical Example","Buying a 5G OpenWrt router with older firmware can make sense, but only under the right conditions. The ZBT Z8102AX shows both sides clearly: the hardware is useful, the modem works, and the router stayed stable in testing, but OpenWrt 21.02, weak packaging and unclear upgrade paths require a careful buying decision.","\u002Fuploads\u002F2026\u002F06\u002Fopenwrt-router-review-dual-sim-05-1781620596218-5ldld4.webp",{"id":513,"slug":514,"title":515,"excerpt":516,"featuredImage":517,"publishedAt":518},"454","zbt-z8102ax-rm500u-ea-5g-modem-test","Quectel RM500U-EA in the ZBT Z8102AX: 5G Bands, o2 Germany and Real-World Signal Behavior","The ZBT Z8102AX uses a Quectel RM500U-EA modem for 4G and 5G connectivity. In the first practical test, the router connected successfully to o2 Germany with LTE Band 3 and NR n28. The modem works, but deeper diagnostics such as RSRP, RSRQ, SINR, band locking and cell behavior still need proper testing.","\u002Fuploads\u002F2026\u002F06\u002Fopenwrt-router-review-dual-sim-06-1781620597879-qay2sx.webp","2026-06-16T08:39:00.000Z","fallback",[],[]]