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

Table of Contents

Usage Notices 4

Precautions for Repair

5 6

ESD (Electrostatic Discharge) Precautions

Instructional Icons

Software Update 7

Updating Software through FOTA

7 7 8 8 9

Software Update Failure

Updating Software through Smart Switch Recovering from a Software Update Failure

Recovering on Another Computer Performing a Factory Data Reset

Quality Test 11 Quality Test Using the Samsung Members App 11 Device Diagnostics 12 Test Items

Calibrations 25 Calibrations 25 Used Parts and Calibration Functions in Supported Models

26 Using the Self Repair Assistant App 31 Optical Fingerprint Sensor Calibration 34 Resetting the Battery Cycle Count 37 Range Sensor Calibration 39 Touch Screen Panel Calibration 41 Speaker Calibration

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