Samsung Galaxy S21 Plus (Snapdragon)

USA S21+ varient not supported. Go cry about it ig.

Steps to install

THIS WILL ERASE ALL YOUR DATA
AND VOID YOUR WARRENTY
AND OBVIOUSLY TRIP KNOX (NO SECURE FOLDER, NO SAMSUNG PASS)

Unlock Bootloader

• Enable OEM unlocking and USB Debugging in developer settings
• Turn Off Your Device
• Boot into Download Mode (Press Up and Down Volume when Powered Off and Connect Cable to a Computer)
• Long Press Volume Up to Unlock Bootloader

Install TWRP

• Download Required files
  • TWRP Images:
    SM-G996B, SM-G996BN
    SM-G9960, SM-G996U, SM-G996U1, SM-G996W
  • VBmeta Verification Disabler
    All varients
• Boot into Download Mode Again
• Open Odin3 (If you don't have Odin, get it from OdinDownload) (Recommend v3.13)
• Put TWRP tar into AP, and VBmeta tar into USERDATA
• Press Start
• Boot back into One UI and Reboot into Recovery with adb reboot recovery
  • ADB; install latest command-line tools for your system
  • Samsung Android USB Driver
• Navigate to Advanced -> Terminal; enter multidisabler

Installing GSI (through TWRP)

• Wipe data
• Factory Reset
• Clear Data + Cache + Dalvik/ART Cache
• Navigate to Advanced -> Terminal; enter multidisabler
• Reboot to Recovery Again
• Push the img image from your computer to the device
• Flash it as a System Image
• Reboot

Brightness

• Go to Phh Treble Settings
• Select Samsung Features
• Press Set backlight scale/max backlight level
• Type -1 in the dialog and press OK and adjust the screen brightness on your phone

Screen flickers

• Go to Phh Treble Settings
• Select Samsung features
• Enable option Enable workaround for white-ish screen
• Go back and select Misc features
• Enable option Disable HW overlays

Enable Always-on-display

• Go to Phh Treble Settings
• Select Misc features
• Enable option Force allow Always-On-Display

Hardware support

Component	Status
Camera	√
Speaker / Mic	√
Bluetooth	√
WiFi	√
SIM / Mobile Data / Voice	√
Brightness	* (Display is dimmed; Fix provided here)
Screen Flickers.	Go to "Screen flickers" for fix method

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@litszwaiboris - 2024/05/20 (Updated:2025/04/18)