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Do not skip these steps, or you may permanently damage your router:
Before flashing new software, you must verify your hardware. The B311s-220 is a single-band (2.4GHz) router that supports LTE Cat4. B311s-220 huawei b311s220 unlock firmware upd
The router will reboot several times. Do not unplug it. Method 2: USB Flashing (For Bricked or Locked Units) Do not skip these steps, or you may
If the interface is buggy after the update, hold the physical Reset button for 10 seconds to factory reset the new firmware. 🚀 Conclusion Do not unplug it
The "UPD" file is the firmware update package. Look for "General" or "Universal" firmware versions, which typically lack carrier branding.
You may need to open the case to short the "boot shot" pins to force the router into USB mode. Drivers: Install Huawei Mobile Connect drivers on your PC.
You will need a Windows PC and a Male-to-Male USB cable if the web interface update fails. 📂 Finding the Unlock Firmware (UPD)