B311-221 Unlock Firmware -

Huawei silently released two PCB revisions. You must match the firmware to your version:

: A prompt should appear asking for a SIMLOCK Code . Enter your unique unlock code and click Apply . The router will reboot and should now show a signal with the new SIM. Advanced: Firmware Flashing B311-221 Unlock Firmware

: This involves overwriting the carrier-branded firmware with a universal "global" version. Huawei silently released two PCB revisions