: This involves installing a modified or "general" firmware version that has SIM restrictions removed.
: Many users can simply insert a non-supported SIM and enter a code in the browser at http://192.168.8.1 . How to Unlock the Huawei B311-221 for Free huawei router b311221 unlock firmware free
Most B311-221 units are locked via a rather than hardware restrictions. Depending on your firmware version (e.g., 21.310.01.00.00 or later), the method to remove this lock varies: : This involves installing a modified or "general"