If your router requires an unlock code:

: Flashing incorrect or corrupted firmware can permanently disable your device.

Using the (or TFTPD32):

Huawei B311s220 Unlock Firmware Upd Guide

If your router requires an unlock code:

: Flashing incorrect or corrupted firmware can permanently disable your device. huawei b311s220 unlock firmware upd

Using the (or TFTPD32):