Whether you need to fix a bootloop, upgrade manually, downgrade for root access, or recover a hard-bricked device, this guide covers everything you need to know about .
When you see "OK," the phone will reboot. First boot takes up to 15 minutes. Huawei Bll-l21 Firmware
Before any development or modification, you must unlock the system's developer environment: Activate Developer Options Settings > About phone Build number seven times. Enable USB Debugging Settings > System > Developer options , toggle on USB debugging Whether you need to fix a bootloop, upgrade