| | Solution | | --- | --- | | "Waiting for bootrom" (stuck) | Reinstall the USB COM driver. Disable driver signature enforcement in Windows. | | Flash fails at 10% | Your router is hardware version B (V711). You need a "Certificate Flasher" (e.g., Huawei Modem Unlock Tool 2024 ). | | SIM still locked after flash | You flashed the carrier’s stock firmware by mistake. Re-download a file with "OPENLINE" or "GENERIC" in the name. | | Wi-Fi disappeared | The firmware is corrupted. Use the "Factory Recovery" method (hold WPS + Reset for 30 sec) and reflash. | | No 4G, only 3G | Manually set the APN and enable "Auto Band" in engineering mode ( http://192.168.8.1/html/band.html ). |
. Unlike temporary software bypasses, a solid unlock for this router remains active even after performing factory resets or installing official software updates DirectUnlocks Core "Solid" Features of Unlocked B311-221 Firmware Permanent Multi-Carrier Support B311-221 Unlock Firmware