How to lock the Bootloader and remove Warning Message: 'The phones bootloader is unlocked and its software integrity can't be verified' when rebooting Samsung Galaxy A12 with Android 12.
Go to Settings to enable Developers Options:
tap about phone,
tap build number 7 times,
go back to Settings,
scroll to bottom,
tap Developers Options.
If Bootloader is unlocked then you can't tap OEM toggle. Scroll down and tap USB debugging, tap OK then turn off Samsung Galaxy A12 to reboot it in device unlock mode.
Connect USB to laptop or PC and while Holding volume up and volume down key's plugin USB-c cable into Samsung device.
Then hold long Volume Up key (3 to 5 sec.)
Press once Volume up key to Continue. Disconnect Samsung when reboots, wait few minutes and you will see Bootloader Unlocked Warning Message has been gone. After this you can set up device until the home screen. Now check Developers Options and you will be able to adjust OEM toggle
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