A bootloader is the low-level software that runs when you power on an Android device. It loads the operating system kernel into memory. Manufacturers lock the bootloader by default to:

Once your device is in Fastboot/Bootloader mode, verify the connection again by typing: fastboot devices

Some brands (Xiaomi, Huawei, Sony) require an official unlock code – but :

: In Settings > System > Developer Options , enable both USB Debugging and OEM Unlocking .

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