The least invasive method involves using a 16-digit unlock code.
Only download B311-221 unlock firmware from reputable tech forums (e.g., 4PDA, Huawei Modem Zone, DC-Unlocker partners). Never run random .exe files claiming to "auto-unlock." B311-221 Unlock Firmware
This indicates that the router did not load the new system image cleanly and is stuck in a boot loop. Repeat the physical short-circuit process using the Balong downloader tool to reload the secondary base bootloader file safely. The Error Code "Find Port Fail" Appears The least invasive method involves using a 16-digit
Huawei silently released two PCB revisions. You must match the firmware to your version: Huawei Modem Zone