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How to perform the factory reset?

1.Power on the TS8211 to display “Hello”
2.Short Press Power key on panel button or RC button, Sbar will show “Sleep”
3.Then long press RC “OK” key 5s, VFD will show “Wait”
4.Then VFD will show “Version”, press RC “Volume Down” key to go to “FACTORY RESET”, then press RC “OK” key, it will show “YES”, Press RC “OK” key, it will do factory reset and will reboot.