Below are the 2 Buttons used to Reset each model of Dash Cam. Hold both the buttons until the device begins to beep. The camera will then reboot, reverting back to default.
U1000- REC and Mic
F800/F800Pro/Q800Pro- Mic and Middle Silver Button
F750 and F770 - Format and REC
X350 - REC and WiFi
X500, X550, X330 - Option to reset in the System Settings
F50 and F70 - Settings on the PC Viewer
F200 and FA200 - WiFi and REC