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yes you can i do it all the time i have gs 3.5 cdx. to play a back up start the gs select start game without cheats or with cheats if you want to use cheats. then you have to find something to hold down the psxs swich so it thinks the lid is closed. the small ones swich is in the front by the open button and the big ones swich is in the back and after you get the swich held down the disk will start to spin slow at firts then faster when it starts to spin faster take out the gs disk and put in the backup it works for me
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