Added:

AUTH V4 algo Huawei modems and routers:

Huawei B310 - direct unlock, reset wrong code counter, firmware upgrade, enable bands;
Huawei E3372h - direct unlock, reset wrong code counter, firmware upgrade;
Huawei E8372h - direct unlock, reset wrong code counter, firmware upgrade;
Huawei E8377 - direct unlock, reset wrong code counter, firmware upgrade;

Unlock tutorials :

Huawei E3372h Unlock guide
Huawei E8372h Unlock guide
Huawei B310 Unlock guide video guide
Huawei E8377 Unlock guide video guide