To Factory Default the Datamax E-Class Mark III ('Basic' & 'Advanced') printer using its top-panel controls... Power cycle the printer: turn it off, wait 30 seconds, and then turn it back on Wait for 30 seconds, to allow the printer to boot up completely Press and hold 'Play / Pause' button until the Status (left) LED (see illustration, below) starts to flash 'RED'. The Status LED will flash orange, then green Once the Status LED starts to flash 'RED' Release the 'Play / Pause' button Wait 30 seconds Power cycle the printer, once more