There are two primary ways to approach the unlock: using an official unlock code (safest) or flashing specialized firmware.
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
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.