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I have 2 Sony DVD recorders DVR GX 455 and GX 355, I sent them for service with United Radio service, they didn’t do anything but they messed up the settings. How can I change the setting from DV1 to the original Sony setting DV 3, I tried several times by pressing ENTER and 3 at the same time it didn’t work. can someone help

You have to change the settings on remote control AND the unit itself. Here is manual on page 22,23 and 84. https://www.sony.com/electronics/support