Even with careful updates, problems occur. Here is how to fix the top three Huawei B311 firmware headaches.
The B311 often includes carrier-specific firmware (e.g., Three UK, T-Mobile). Modem firmware resides on a separate flash partition (/dev/mtdblock5). Tools like AT^SFM can modify band priorities but void warranties. huawei b311 firmware
This is the safest and easiest method. If your router has an active internet connection: Even with careful updates, problems occur