Use a third-party web interface like LTEPROXY or HuaCtrl for band locking without TELNET.
There is a reason this is a hobby for the brave. The B311s-220 has a "Bootloader" (the router's BIOS). If you flash the wrong firmware—say, a firmware meant for the older B310s-927—you will "brick" the device. The power light will flash weakly, the web interface will go silent, and you will be left with a black plastic box that gets warm but does nothing. huawei b311s220 unlock firmware upd
That was the phrase that had consumed his nights for a week: . Use a third-party web interface like LTEPROXY or