Denon DBP-1611UD Service Manual page 19

(9) C lick Write(F2).
(10) W hen Pass changes to green, writing to the Flash ROM of the MAIN PWB UNIT is complete.
(11) S witch off the set unit power, and remove the 232C (TTL) side 4P P connector of the USB - 232C (TTL) conversion
jig from the MAIN PWB UNIT (CON601).
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