B311221 Unlock Firmware Link Official

XDA is the gold standard for device modification. Search for “Huawei B311221 unlock” in the XDA CPE/Router forums . Look for threads with high reply counts and “Confirmed working” tags.

If you want to reflash stock firmware to fix corruption: b311221 unlock firmware link

Flashing firmware meant for a B311As-853 or B310 onto a B311-221 will "brick" the device, rendering it a paperweight. The Unlocking Process: How It Works XDA is the gold standard for device modification

If the device is "hard-locked" (no code prompt) or has a custom provider UI that you want to remove, you would need to flash "General" or "Global" firmware. b311221 unlock firmware link