tftp -i <TFTP_SERVER_IP> get B311-221V2.34.T34
Open Huawei Firmware Flasher or Balong Flash Tool . huawei router b311221 unlock firmware patched
If you simply need to update to the latest official software (which does unlock the carrier): Huawei B311-221 Firmware Release Notes | PDF - Scribd tftp -i <TFTP_SERVER_IP> get B311-221V2