Liqwidist, To play dvd-r backups with a USB mod you will need a GS2 v 1.9 or 1.93. You also will have to do the card swap or cog,knife method for the final swap. I had a usb mod but didnt like taking the tray cover off and sticking a plastic knife in it to make the tray eject (which is what you are going to have to do)so i ditched it for a X-key dvd chip and a r-mod. Anyway if you still want to try this here's how, do so at your own risk!!. Load GS2, when completely loaded turn on chip, select start game, press eject, swap GS2 with original dvd game, I use DOA2, select without codes, wait about 15 sec then preform cog,knife method to swap original dvd with dvd-r backup,push tray back in and press o+r1, Game will load....There are alot of modchips that will boot dvd-r backups on a v4. You may want to invest in one. Good luck
