There is no official or "verified" public unlock firmware for the Huawei B311-221 router
Huawei B311-221 is a 4G LTE Category 4 wireless gateway designed for users who need reliable, plug-and-play internet in locations without traditional landlines. While the device offers solid performance with download speeds up to huawei router b311221 unlock firmware verified
This method uses a service code to enter “factory mode” and pushes an unlocked customize.bin . There is no official or "verified" public unlock
Your router will respond with an unlock code. Note down this code. huawei router b311221 unlock firmware verified
Most manufacturers and service providers will void the warranty if the device has been tampered with or if unauthorized software is installed.