Press VOLUME UP and VOLUME DOWN alterating until "VER X" is displayed (X=current RC)
Press RIGHT and LEFT alternating until "VER 255" appears
Press SETUP again
Classic DVD-103 / DVD40
Open the tray
Press SETUP, NEXT, PREV, NEXT, PREV
Press Down three times (go to 5001), then press LEFT/RIGHT (or SETUP) to set it to 5000
Press SETUP again
IF NO RESPONSE: VOLUME +, VOLUME -, VOLUME +, VOLUME -
Classic DVD-50S / DVHE150R
Press SETUP
Press NEXT, PREV until display shows "VER 1"
Change the region code using LEFT/RIGHT keys (or press 2,5,5 for multi region)
Press SETUP, SETUP
Classic DVE210 / DVHE320R / DVR-1000 / DVR-2001
no known hacks
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