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

Calibrations

Speaker Calibration When replacing speakers, the speaker must be calibrated to guarantee optimized speaker performance for devices that have it. Speaker calibration is available through the Self Repair Assistant app. 1 Launch the Self Repair Assistant app. 2 Select the part that you have replaced and tap Next .

3 Check part and calibration and tap Next .

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