How to do master reset on Samsung depends on device type, with different procedures for appliances and phones. For Samsung washing machine master reset to factory defaults, turn off washer, unplug from wall for 5 to 10 minutes to discharge control board, press and hold Power button for 5 seconds while unplugged, plug back in, turn on, and run calibration by pressing Temp and Delay End together for 3 seconds then Start with empty drum. For Samsung refrigerator master reset, unplug for 5 minutes or press Power Freeze and Power Cool for 10 seconds. For Samsung phone master reset factory data reset, go to Settings, General management, Reset, Factory data reset, confirm with PIN, or if phone locked out, turn off, press and hold Volume Up and Power buttons until Samsung logo appears, enter Android recovery menu, use volume buttons to select Wipe data factory reset and confirm. This erases all data. For Samsung TV, Settings Support Self Diagnosis Reset enter PIN 0000. Always backup data before master reset as it erases everything.
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