The update might have deactivated LTE bands. Under Network Settings , manually set network mode to “4G Only” (if available) or “Auto 4G/3G.” Also, try reseating the SIM card.
You tried to install a firmware version meant for a different hardware revision (e.g., B312-936 or a country-specific variant). Solution: Double-check your current firmware region. Look for packages specifically labeled “B312-926 [Your Carrier].” b312-926 firmware
Complete Guide to Huawei B312-926 Firmware Updates and Management Huawei B312-926 The update might have deactivated LTE bands
Open a browser and type 192.168.254.254 (default for Globe) or 192.168.8.1 . Log in with your admin credentials. b312-926 firmware
If your B312-926 is stuck in a boot loop or won’t respond, you can force a firmware reload via TFTP.