#reboottobootloader #galaxyA20 Reboot to bootloader is a simple way to enter Download Mode / ODIN Mode. But If you want to unlock / lock bootloader, you must enter advanced download mode / Odin Mode. In bootloader mode, you can flashing official rom, flashing custom recovery like TWRP Recovery ( unlocked bootloader ) and flashing custom rom ( unlocked bootloader ).
Related video: How to Unlock Bootloader Samsung Galaxy A & M Series
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reboot to bootloader, download mode, Galaxy A20
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