One UI 7 Android 15 | Galaxy S10, S20, Note 20, S21, S22 ! (ExtremeROM)

ExtremeROMNexus is unified custom ROM for the samsung Galaxy S10, S20, Note 20, S21, S22. Current version V2.6.1 using One UI 7 Android 15. Check they're page here

Use case : Your samsung devices dont get any android update and you want to taste the Samsung AI

Disclamer

Not recomended for newbie, failed can make your device hardbrick!
Use at your own risk! I am not responsible for your actions.
Make sure read all the instruction & watch the video carefully.

Prerequisite

• Use at your own risk! I am not responsible for your actions
• I will try to keep update this page
• Your phone should allready be unlock the bootloader
• Complete check for their github pages
• Take IMEI Backup !! Store backup on pc/sdcard (nvram,nvdata,persist,persistents,protect_f,protect_s and EFS for snapdragon)

File Needed

• SAMSUNG_Driver_v1.7.61
• ADB fastboot Platform-tools_r33.0.3
• Odin3 v3.14.4
• ExtremeROMNexusV2.6.1 C(ustom recovery and customROM Include)
  Password is : ExtremeROMNexusV2.6.1

Supported Devices

• Galaxy S10 Series (S10e, S10, S10+, S10 5G)
• Galaxy S20/Note20 Series (S20, S20+, S20 Ultra, S20FE, Note20, Note20 Ultra)
• Galaxy S21 Series (S21, S21+ S21 Ultra, S21FE)
• Galaxy S22 Series (S22, S22+ S22 Ultra)

Noted : For Galaxy S10 Series you need to flash repartition file on custom ROM

Combination Key

For S10 series

• Download mode : vol down + bixby key 
• Recovery :  press vol up + bixby + power
• Force Reboot : Hold Volume Down + Power for 7–10 seconds

S20 series or later

• Download mode : vol down + vol up
• Recovery :  press vol up + power
• Force Reboot : Hold Volume Down + Power for 7–10 seconds

Bootloader Unlock 

Enable Developer Options

• Firstly, Open settings
• Then, select About Phone, then hit the Software information tab.
• Next, tap on the Build Number 7 times to activate developer mode on your device

Enable OEM Unlock

• Go back to the Settings screen, scroll down and tap on Developer Options.
• Now, find and turn on the switch beside Enable OEM unlocking.
• A confirmation prompt will come up, press Enable.

Unlock The Phone

Refer the combination key the above post

• Power off the phone 
• Boot into download mode
• Connect the USB cable from you computer > Wait until blue screen appears
• Press and hold volume up for about 7 seconds.
• Press volume up 1second
• The phone will automaticly restart
• Wait until you see it formating the data
• When it finish  > Boot into download mode again
• Press volume up 1second
• Now you ready to install the custome recovery
• From here read next post

I'm refering to this post with modification

Installation Guide

Before in here you must complete above instruction and download latest stock rom for each of your devices. We need stock Bootloader (BL) and Modem (CP). Search your phone from samfw.com

• from Download mode,  flash AP, CP and userdata (custom recovery)
  
  
  
  
  
  
• Hit flash button
• immediately boot into recovery mode
• Format data 
• factory reset (dalvik, data, cache)
• Reboot recovery
  
  
  
  
• Advanced > adb sideload > repartioning.zip (only for s10 series!)
• Advanced > adb sideload > adb ExtremeROMNexus.zip
  
• Wait until it finish
• Format data 
• factory reset (dalvik, data, cache)
• reboot

You check the source here