ZTE MF79U (4G UFi) Stock firmware issue: Band 20 locked out → poor indoor reception Custom firmware used: OpenWrt-based firmware from GitHub Outcome:
A: Possibly, using a JTAG or UART interface. This requires soldering skills and advanced knowledge. For most users, a bricked dongle is e-waste. 4g Ufi Dongle Firmware
Sites like XDA Developers or specialized Telegram groups are the best sources for "clean" or "unlocked" firmware. Troubleshooting Common Issues ZTE MF79U (4G UFi) Stock firmware issue: Band
