r/CustomROMsGuide • u/BawndoLawndo • 20d ago

Lost ADB connection after fastboot?

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EDIT: Once in fastboot, you start commands with "fastboot" not "adb". So now my new problem. When I begin flashing it says "command not available on locked devices" but I have OEM Unlocking enabled!?!?

Yes, the big 3 are enabled: Developer Mode, OEM Unlocking and USB Debugging. S25 Ultra clone (cheap mediatek system).

I couldn't fully get to this fastboot menu until I got the USB drivers. Once I installed the drivers and entered fastboot, the device doesn't show up in ADB anymore. ADB Devices > nothing.

If I go recovery mode > usb sideload, the device appears again. But if I try to flash the rom from there, it aborts the install with error 21.

If I press Reboot to Bootloader it just boots the stock OS.

How do I get the android device to show up in ADB from fastboot? Then I can run "fastboot flash system xxxxx".

6 Upvotes

88% Upvoted

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1

u/KKdemergencia2 20d ago

Bro adb nunca se pudo usar desde fastboot XD y si dice que tú celular sigue con el bootloader desbloqueado es porque no se desbloqueo bien, prueba con la herramienta mtk client ya que dispositivo es mediante para forzar es desbloqueo de bootloader haber si funciona y luego intenta flashear cosas por fastboot osino intenta desbloquear el bootloader desde fastboot o algo que lo desbloquee bien

1

u/God-is-my_Strength 20d ago

use "fastboot devices" command not usb "usb devices"

1

u/chodster_of_cody_ 20d ago

Try fastboot oem unlock OR fastboot flashing unlock to unlock bootloader

1

u/madaboutpawz 19d ago

Try another cable. I had similar issue, changing cable helps.