Several firmware versions are compatible with the Huawei B311s-220. Here are a few verified options:
This 2,000+ word guide covers everything: what verified firmware is, where to find it, how to flash it, and post-unlock optimization. huawei b311s220 unlock firmware verified
Tired of being locked to a single network? It’s time to take full control of your Huawei B311s-220 4G LTE Router Several firmware versions are compatible with the Huawei