Sony XR-83A80L - Page 145

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Factory Data Reset – force method (without UI)
1. Press and hold the Power button. (The position of the Power button depends on the model.)
2. AC on.
3. Hold the Power button down for several seconds until the system starts Factory Data Reset.
or
SOFTWARE UPDATE & RESET
SYSSET
2023/11/2806:39:49(GMT+09:00)