Is there a way to unpatch a game?

I'm trying to understand your problem that is solved by the "Swap Utility" patches. What PS2 do you have? Jap? Why do you need to back out of the Universal Patcher.

####://www.ps2ownz.com lists the patches for each boot method. I assume for the moment that you have a JAP PS2 and swap with the Utility Disk. What modchip do you have? SO far as I know the Universal Patcher is the surest way of getting a backup to boot with the Utility Disk.