https://us.community.samsung.com/t5/Galaxy-S21/Calibrating-laser-AF-S21-Ultra/td-p/2872672
Solved: Calibrating laser AF S21 Ultra - Samsung Community - 2872672
Apr 28, 2024 - Solved: According to the Samsung documentation on ifixit on page 10 (link below) it mentions Self Repair Assistant app to calibrate sensors - 2872672
samsung communitysolvedcalibratinglaseraf