r/GalaxyS21 • u/Ark_rivia • 25d ago

question Firmware Flash

Hi. Anyone knows how to to flash Samsung phones? I need to flash my S21, SM-G991U to SM-G991U1 XAA unlocked firmware. Currently it's on Android 12 and One UI 4.1

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u/OluwaKorede_Hemnars 25d ago

https://samfirms.com/guide

I recently just did, last weekend. Use Odin to flash it. Highly recommended.

Also things to note, use a USB A to C cord not C to C. Download the firmware from samfw, extract then flash it. Quite easy.

Don't forget to backup with Samsung Smart Switch, note open Smart Switch as Administrator on Windows, else you might get error when restoring it.

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u/TheMemeGrabber 18d ago

Does it help with battery life

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u/OluwaKorede_Hemnars 18d ago

To be honest, no. I've experienced no difference.

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u/TheMemeGrabber 18d ago

Aiight thanks