Enthusiasts use modified firmware to gain Root ADB/Telnet access , change IMEI for mobile plan compatibility, and add features like OpenVPN or TTL mangling to bypass hotspot limits.
To flash firmware on a B311-221 without installing heavy software, you can use: huawei b311221 firmware portable
If you are searching for a "portable" way to update your router—meaning you don't want to install the "Huawei Mobile Partner" software or ISP bloatware on your PC—you are looking for or ** extracted firmware executables**. Enthusiasts use modified firmware to gain Root ADB/Telnet
Easier handling of diverse Access Point Name (APN) settings for different mobile carriers. change IMEI for mobile plan compatibility