Yes. SIM unlocking (the focus of this article) removes the restriction that prevents you from using other carriers' SIM cards. Bootloader unlocking is a deeper procedure that allows you to flash custom operating systems entirely. For the B311-221, you only need a SIM unlock.
If flashing firmware feels too risky, check if your router asks for an when you insert a different SIM. huawei router b311221 unlock firmware free
The most severe risk is "bricking" your router, rendering it as useful as a brick. This occurs when the firmware flashing process fails, either due to corruption, an interrupted power supply, or the use of an incompatible firmware file. A bricked device will not boot, will not respond to the normal reset button, and will not be recoverable without specialised hardware tools (like a JTAG programmer). For the B311-221, you only need a SIM unlock
For many newer Huawei B311-221 routers, especially those locked to specific carriers like Morocco's Inwi, the simple IMEI code method may not work . Reports indicate that some carriers have disabled this feature in their firmware, meaning a code will not be accepted. If this happens, you may need to explore the advanced methods below. This occurs when the firmware flashing process fails,
: Allows up to 32 simultaneous users to connect via Wi-Fi.
Most unlocks require the router to be in a special state to accept new software. Power off the router. Connect it to your PC via LAN or USB.
: Most online resources that claim to have "unlock firmware" for this specific model are actually paid remote unlocking services customer support contact for your specific carrier to request an official unlock?