First off, the bootloader isn't part of Android, it's what lets the device boot into Android. Device manufacturers generally want you to stick to the version of Android they preloaded on the device.

Unlock your bootloader, but do not flash your custom recovery yet. Reboot. Your device will force-boot into stock recovery, wipe data and cache, then reboot again.

How to flash bootloader of your Galaxy Note8 that’s stuck on boot loop By Harvey Hisona November 1, 2019 September 1, 2023 A lot of people encounter boot loop issue from time to time.

Android phones have a recovery mode that lets you access the bootloader and wipe data if you're unable to normally boot your phone.

Boot OnePlus 3/3T into fastboot mode either by long pressing the power button and then selection the Bootloader mode, or either pressing volume up + power button after turning off the device.

The phone will take some time to boot, and all the data will be erased. The bootloader of Realme X2 Pro is successfully unlocked! We hope you have successfully unlocked the bootloader of Realme X2 ...

Navigation is handled with volume and power buttons, and if there’s a failure in the bootloader boot stage, p-boot will automatically shut down your device. here’s also a 5-bit binary blinking ...

An XDA Forums user confirms that after unlocking the bootloader, the Z Fold 3’s cameras were completely non-functional: facial recognition, loading the camera app, and trying third-party camera ...