Use a USB TTL serial adapter to capture the boot log and unlock the hidden telnet port (port 8023). This allows you to change band preference via AT^HFREQSCAN commands.
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: Maintain all original features, including dual-stack IPv4/IPv6 support, SMS management, and the HUAWEI HiLink App How to Unlock Your HUAWEI B311-221 Use a USB TTL serial adapter to capture
Once your PC detects the device as HUAWEI Mobile Connect - DownLoad port , install the necessary COM port drivers. including dual-stack IPv4/IPv6 support