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In order to stop your SpringBoard from restarting you need to follow some simple steps. There are lots of ways to do this but this one is definitely the easy one that I've found till now.
- Download iFile from Cydia.
- Goto: System/Library/Coreservices/Springboard.app then edit N82AP.plist for iPhone 3G and N72AP.plist for iPod 2G.
- Change the line < key >
opengles-1 < / key > to: < key >opengles-2 < / key > . (i.e. only change the integer : 1 to 2) - Restart your device.