Only flash the exact firmware meant for your device model.
fastboot devices
April 14, 2026 Reading Time: 6 minutes
To check if fastboot sees your device (Volume Down + Power on most phones):
# Typical location export PATH=$PATH:$HOME/Android/Sdk/platform-tools echo 'export PATH=$PATH:$HOME/Android/Sdk/platform-tools' >> ~/.zshrc
# Reboot to bootloader adb reboot bootloader fastboot -w Flash a custom recovery (TWRP) fastboot flash recovery twrp.img Reboot the device fastboot reboot Debugging the "Unknown" Issues Ever seen adb devices show unauthorized ? The RSA fingerprint changed. Revoke USB debugging authorizations on the device (Developer Options) and restart the ADB server:
Loading...
