How to Unlock Bootloader on Galaxy A10s

How to unlock bootloader:

- Backup all your media, this process will delete your internal media including music and photos

- Go to developer settings and enable [OEM Unlock]

- Reboot to download mode

- When prompted, press and hold VOL + to enter bootloader unlock mode

- Press VOL + to confirm you want to unlock bootloader, this will wipe your data

- If you think the bootloader is fully unlocked, it is actually not! Samsung introduced VaultKeeper, meaning the bootloader will still reject any unofficial partitions before VaultKeeper explicitly allows it.

- Go through the initial setup. Skip through all the steps since data will be wiped again later when we flash TWRP and magisk

- Enable developer options, and confirm that the OEM unlocking option exists and is grayed out. This means the VaultKeeper service has unleashed the bootloader. This step is MANDATORY

- Your bootloader now accepts unofficial images in download mode.