From the watch face, hold . Select System > Reset. To reset all of the watch settings to the factory default values and save all user-entered information and activity history, select Reset Default Settings. To delete all activities from the history, select Delete All Activities. To reset all distance and time totals, select Reset Totals.
Each time, I followed the steps I'd been given by the Garmin support rep (I'm on a PC): Go to Garmin device in Explorer; Delete folders ACTIVITY, NEWFILES, REMOTESW on the device itself; Eject device, restart device; Plug in device, sync again if the above don't help, then: Quit Garmin Express; Eject Garmin device, restart device
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garmin forerunner 735xt factory reset