I've had my iPod jailbroken for a year and a bit. I installed iLock from Cydia, and the lock screen wouldn't open, so I reset my iPod and it worked. However, it didn't work a second time, so I put my iPod into restore mode and tried to restore it. However, iTunes tells me that it cannot restore my iPod.

So, am I screwed? Is there anything I can do?

If there is nothing I can do, can the shop repair it?