Place a SIM card from a different carrier into the router and power it on.
Unlock firmware is a modified or official software version that removes the SIM lock restriction. In many cases, you may only need to update to a "General" or "Global" firmware version to enable the SIM lock menu, where you can then enter a unique 15-digit IMEI-based unlock code. B311-221 Unlock Firmware
A more recent version that includes security patches and improved web UI features. How to Unlock the Huawei B311-221 Place a SIM card from a different carrier
Access the management page (usually 192.168.8.1 ). A prompt for a "SIMLOCK Code" or "NCK" should appear. Enter your code and click Apply . Method 2: Firmware Upgrade/Flash A more recent version that includes security patches
Often used to fix stability issues and is a common target for those looking for "clean" firmware.