THIS GLITCH HAS BEEN FIXED AS OF MAY 2022. IF YOUR FIRMWARE IS PAST THAT SECURITY LEVEL YOU CAN NOT OPEN THE BOOTLOADER ANYMORE.
WARNING! THIS IS EXPERIMENTAL, I HAVE NO IDEA WHERE WE CAN GO FROM HERE.
THIS MIGHT BREAK YOUR DEVICE!!!
UNLOCKING THE BOOTLOADER REQUIRES A WIPE AFTERWARDS!
UNLOCKING THE BOOTLOADER WILL DISABLE YOUR FINGERPRINT READER! (FIXED BY RELOCKING)
UNLOCKING THE BOOTLOADER MIGHT REMOVE BOKEH MODES FROM PORTRAIT. (NOT SURE)
This is a breakthrough! Thanks to our crazy russian friend in this thread I succeeded in opening the bootloader. (Origin OS)
Unlocked models with this method: Vivo Y31 PD2050F 2021 A12 6.7.20 Vivo V21e PD2107F A12 6.6.19 I did it from rooted Samsung J120F, I didn't try from PC///bc no PC =( My guide in Russian {Mod edit: Link removed} Custom fastboot for vivo in...
forum.xda-developers.com
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Long Tutorial:
Download 1: https://forum.xda-developers.com/t/guide-how-to-reboot-to-edl-from-fastboot.3394292/
Download 2 vivo fastboot_v2:
https://forum.xda-developers.com/t/how-to-unlock-bootloader-of-vivo-phones.3686690/
Download 3 vendor.img:
https://forum.xda-developers.com/t/...hers-new-vivo-oppo-models-check-list.4440801/
NEEDED: Vivo USB Driver
NEEDED: ADB and Fastboot (Added to PATH)
1. Enable OEM Unlock in Developer Options
2. Connect your device via ADB
3. Use "adb reboot fastboot"
4. Use "fastboot reboot bootloader" -> This fastboot now looks different
5. Copy the vendor.img into the folder of Download 2
6. Open two cmd's in Download 2
7. Type in "fastboot vivo_bsp unlock_vivo" into the first one, hit enter
8. Type in "fastboot flash vendor vendor.img" into the second one, hit enter
9. Immediately switch back to the first one, press up and enter many times
10. If you time this right your bootloader is unlocked
11. Press the power button to restart the phone and see your bootloader warning
12. Let the phone restart a few times until it asks you to wipe
13. Select the first option, then select the one on the right to proceed
I unlocked, relocked and unlocked again to be sure, this seems to be a safe method!
Much thanks to
@Naveen Singh and
@Pervokur