These are modified stock firmwares (not open-source like OpenWRT). They unlock hidden features.
Before clicking that upgrade button, run through this checklist: Huawei B311 Firmware
If your B311 is from Vodafone, Telstra, or another carrier, you must get the firmware from that carrier. Unlocked generic firmware often removes carrier-specific APN settings and VoLTE configurations. These are modified stock firmwares (not open-source like
Each model requires specific firmware. Flashing the wrong version can permanently brick the device. or another carrier