ONUI 7.0 for S10, S20, S21, S22, and Note20 series – Installation Guide for ExtremeROM

How to Install ExtremeROM Nexus (Full Guide)

⚠️ WARNING:

• This will WIPE your device completely

• Make backups of everything before proceeding

• Proceed at your own risk — this is for advanced users only

✅ What You Need

Before flashing ExtremeROM Nexus, prepare the following:

• 📱 A Samsung phone with unlocked bootloader

• 💻 A computer with:

  • ADB & Fastboot installed

  • Odin3 (latest version)

  • Samsung USB drivers

• 📦 Files required:

  • ExtremeROM Nexus ZIP

  • Repartitioner.zip (some devices)

  • Cleaner.zip (some devices)

  • Hotfix ZIP (if using ROM v2.0)

  • Odin BL/CP files or Odinpacks for your device
    Download files from here

📲 Instructions by Device Series

📱 S10 Series (S10e, S10, S10+, S10 5G)

1. Flash BL + CP via Odin:

   • Open Odin

   • Load the Odin Pack into the AP slot

   • Disable Auto Reboot

   • Start flashing 

2. Reboot to Recovery:

   • Hold Power + Vol Down + Bixby

   • As screen turns off, quickly switch to Vol Up + Power + Bixby to enter TWRP

3. In TWRP:

   • Tap Wipe → Format Data → type yes

   •  

   • Then perform a Factory Reset

   • 

   • Reboot Recovery again

4. ADB Sideload Prep:

   • Tap Advanced → ADB Sideload → swipe to begin

   • 

   • On your PC, run:

     adb sideload repartitioner.zip
     

   • 

   • Once done, device reboots to recovery

5. Sideload Cleaner:

   adb sideload cleaner.zip
   

6. Sideload ExtremeROM:

   adb sideload ExtremeROM-Nexus-[your_device_model].zip
   

   

7. (Optional) If on v2.0 ROM:

   adb sideload hotfix.zip
   

8. Tap Reboot System and wait for boot.

📱 S20 / Note20 / S21 / S22 Series

1. Flash stock BL and CP via Odin (use USERDATA slot if using OdinPack).

2. Reboot into TWRP or custom recovery.

3. In recovery:

   • Wipe → Format Data → type yes

   • Then Factory Reset

   • Reboot Recovery

4. Use ADB Sideload to flash:

   adb sideload ExtremeROM-Nexus-[your_device].zip
   

5. Tap Reboot System

Note: These newer models don’t require repartitioner or cleaner zips, unless explicitly instructed.

🧠 Tips & Notes

• ❗ Do NOT dirty flash over other ROMs.

• ✅ You can update from older ExtremeROM Nexus builds without wipe, unless stated otherwise.

• 🧼 Flash cleanly if changing major versions (like v2.0 to v3.0).

• 🧩 Use correct Odinpacks from trusted sources only.

• 🔌 Use original USB-C cable to avoid sideload errors.

• 🔥 First boot may take 5–10 minutes — don’t panic.

🆘 Troubleshooting

✅ Final Thoughts

ExtremeROM Nexus offers high performance, stability, and customization. As long as you follow the steps per your device series, you’ll have a clean and successful install. Always double-check file versions and don’t skip formatting unless the developer explicitly allows it.

ALL CREDIT GOES TO EXTREMEXT TEAM