Complete Samsung Galaxy S21 Lock Bootloader Tutorial | S21+ & Ultra too

[@doug3182]

Relocking the Galaxy S21 bootloader will not undo KNOX being tripped, but it will let you download and install OTA updates like normal again.

[@shadav7114]

Excellent! Finally found a video that helped me! Thank you!

[@antoniogreen4151]

Worked like a charm.

[@senol.32]

Thank you very much :)

[@ExplainingAndroid]

you're most welcome :) If you're able to, please consider becoming a KZbin channel member here - www.youtube.com/@ExplainingAndroid/join If not, then liking the video, subscribing to the channel, and sharing it online are all great things that can help, too

[@voreey.9673]

So easy after 2h trying to know how to do that aha, thx !!

[@itayr4827]

Thanks for the great info, however my download mode (showed at 3:58) does NOT have the volume up option anymore. I am trying to relock the bootloader but couldn't find a way to do it, my download mode only has volume down option (restart device) Please help!

[@ExplainingAndroid]

are you booting into download mode with the USB cable method?

[@itayr4827]

@@ExplainingAndroid yes indeed

[@samikemashiku5054]

When you say original firmware you mean the firmware that originally shipped with the device or any stock firmware with a later android version?

[@ExplainingAndroid]

any official samsung firmware

[@MuhammadUsman-bc6qf]

Please i have s21+ korean version and it doesn't have esim available,what if i flash the firmware to another country's firmware will i get the esim capability. If yes what country firmware do you recommend i switch to?

[@klauskitkat9280]

Can you tell if it's possible to install like CalyxOs since it's possible to relock the bootloader?

[@ExplainingAndroid]

it's never advised to relock the bootloader after installing a custom ROM

[@Gandalf192]

So i should first download and flash 100% stock firmware and then relock the bootloader right?

[@debratyler466]

How do I find your other videos?

[@ExplainingAndroid]

you can find all of my videos here - kzbin.infovideos

[@KanshouXBakuya]

i know this video is old but can i relock the bootloader after unlocking it and nothing bad happens?

[@VTR1756]

Does this work with US model?

[@Mmotley93]

when i try to reset it, it takes me back to to bootloader screen says downloading and has an error. "Reason vbmeta: Error verifying vbmeta image: HS_IMTHSGAUEMSAC HELP!!!!

[@akutennisman]

Same issue here. Plz help

[@cursedvideos911]

Did u flash stock ROM?

[@o0h775]

Same issue here. The most you can do is unlock the bootloader again and reset the phone. To lock the bootloader, as far as I know, you need the Odin3 program and the stock firmware. However, I’m hesitant to try it myself because I’m afraid the phone might end up like a brick.

[@JesviJonathan]

thank you !

[@robertomoro2491]

help to lock bootloader S21+, i tried but the result is already unlock and OEM pushbotton is deseable. THx

[@Taha-js4bm]

I dont have the oem unlocking option in my settings. I'm on an s21.

[@Official__RILO]

He told you to register the device by checking for an update then wait awhile / reboot and it will come back

[@JohnDoe-mf5db]

@@Official__RILO no, it does not work at least with t-mobile.

[@Official__RILO]

@@JohnDoe-mf5db I didn't even have to reboot. I'm with o2

[@JohnDoe-mf5db]

@@Official__RILO what model brand carrier and android version are you on?

[@funkingonuts1313]

I did everything here but my bootloader is stilled greyed out?