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Connect the device to internet in the setup! Just when you think the bootloader is unlocked, it is actually not! Samsung introduced VaultKeeper, meaning the bootloader will reject any unofficial partitions before VaultKeeper explicitly allows it. Long press volume up to unlock the bootloader.Using the fastboot command: adb reboot download. Allow bootloader unlocking in Developer options → OEM unlocking.Bootloader unlocking will wipe your data. First to backup all your files, photos, and vedios in your Samsung device.Just download the Google SDK Platform-Tools package for using the adb and fastboot. USB Cable (the original one recommended).

Samsung Device with Android 9 or higher.How to unlock bootloader of Samsung with Android 9.0 or higher Getting Started: Preparation While, Samsung running Android 9.0 pie or higher need to use another method to unlock the bootloader compared to the previous Samsung devices. Users may have their own reasons for unlocking the bootloader of the Samsung devices.
