Have you successfully flashed a B311-221? What region and firmware version are you running? Let us know in the comments—but please, no direct download links to unverified files.
Flashing generic firmware (e.g., the Russian or European unbranded version) removes the ISP lock and APN, but it often on specific networks. Furthermore, you cannot revert to ISP firmware without a full backup of the original flash partitions—something 99% of users do not have. huawei b311-221 firmware download
If you own a Huawei B311-221 4G LTE router, you have likely encountered a frustrating reality: finding official firmware is like hunting for a ghost. Have you successfully flashed a B311-221