Repair guide Galaxy S21 (SM-G991B) - English - Rev.1.0

Calibrations

• Depending on the model, the screen module may include batteries. So when the screen module is replaced, the battery also has to be selected and a battery cycle reset must be performed. • In the Fold models, touch screen panel calibration is performed for both the main and cover screens. • Digital hall sensor calibration is only for the Fold and Flip models and under-display camera calibration is only for the Fold models.

Using the Self Repair Assistant App 1 Download the Self Repair Assistant app from Galaxy Store .

For US devices, you need to install the APK file for the Self Repair Assistant app manually. However, if the Auto Blocker function which is provided from Android OS 14 (U OS) is turned on, you cannot install any APK files manually through the My Files app. In this case, launch the Settings app, tap Security and privacy → Auto Blocker , and then tap the switch to turn it off to install the Self Repair Assistant app.

2 Launch the Self Repair Assistant app.

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