Samsung Self Repair Assistant on unsupported devices (Hall IC Calibration methodology on Galaxy Fold 4)

selfrepair.md

Samsung Self Repair Assistant on Unsupported Devices (Rootless Method)

Updated guide – no root required

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Disclaimer

• This guide is not a beginner step-by-step tutorial. Basic familiarity with ADB and Android system settings is assumed.
• No root or bootloader unlocking is required for this updated method.
• While this approach avoids flashing or data wipes, it still relies on undocumented behavior and is not officially supported by Samsung.
• Proceed at your own risk.

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Tested Functionality

• Hall IC calibration confirmed working on Galaxy Fold 4 (F936U).
• Other functions (e.g., battery calibration) have not been fully tested.

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Background & Rationale

Samsung’s Self Repair Assistant app enforces a device compatibility check that prevents it from launching on older Fold/Flip models.

Originally, bypassing this required root access to manually start the app’s internal activity (GcWelcomeActivity).

However, thanks to recent findings, it turns out Samsung allows private / hidden apps to be launched through system-level shortcuts — specifically by abusing the Side Key double-press configuration, which runs with elevated privileges.

This makes it possible to launch the app without root, Magisk, or firmware modification.

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Credits & Acknowledgements

Huge thanks to the community members who made this rootless method possible:

• @MBersnk – discovered the Side Key / SetEdit workaround
• @lixiangwuxian – confirmed it working on F936U and provided the ADB permission command

This update would not exist without their contributions. 🙏

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Requirements

• Samsung device running OneUI
• ADB installed on your computer
• Internet access (for Samsung Account login)

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Instructions (Rootless Method)

1. Install Samsung Self Repair Assistant

• Download the APK with package ID:

  com.samsung.android.app.repaircal
  

• APKMirror or similar repositories work fine

• Tested with version 2.0.17

Install the APK normally.

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2. Install SetEdit

• Install SetEdit from the Google Play Store: https://play.google.com/store/apps/details?id=by4a.setedit22

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3. Grant SetEdit Secure Settings Permission

Connect your phone to your PC and run:

adb shell pm grant by4a.setedit22 android.permission.WRITE_SECURE_SETTINGS

This allows SetEdit to modify system-level configuration values.

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4. Configure Side Key Double-Press

On your phone:

1. Open Settings → Advanced features → Side key

2. Set Double press to:

   • Open app
   • Select Samsung Self Repair Assistant

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5. Override the Side Key Target Activity

1. Open SetEdit

2. Switch to the Global Table

3. Find the key:

   function_key_config_doublepress_value
   

4. Change its value to:

   com.samsung.android.app.repaircal/com.samsung.android.app.repaircal.GcWelcomeActivity
   

5. Save the change

This forces the Side Key to launch the app’s internal entry activity, bypassing the compatibility check.

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6. Launch the App

• Double‑press the Power / Side Key
• The Self Repair Assistant should now launch normally
• Log in with your Samsung Account when prompted

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Notes & Limitations

• This method relies on Samsung-specific behavior and may break with future OneUI updates
• The app may still block certain features depending on device model
• No APK modification or resigning is required

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Conclusion

This rootless approach is simpler, safer, and fully reversible compared to the original Magisk-based method.

It significantly lowers the barrier for using Samsung’s Self Repair tools on older Fold / Flip devices and aligns well with the Right to Repair philosophy.

If Samsung ever removes this loophole, root-based launching may still remain a fallback — but for now, this is by far the cleanest solution.

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Original guide by Luca Corigliano – updated with community contributions

Just made the mistake this morning to update the phone to android 16... It's seems not compatible anymore sadly

EDIT : I was wrong, you can go to the self repair app by going to samsung's website !!!

Go to https://samsungparts.com/pages/self-repair-services, input your phone model and click self repair assistant

Thanks to BCG-Car! My phone is a Samsung Galaxy A73 5G, Thai region. At first, I thought that the “Device not supported” message might be caused by a regional restriction. So, I tried downloading the APK by entering the model as Samsung Galaxy A71 instead, and it worked! I was able to calibrate new battery.