If you’ve jailbroken your iPod touch or iPhone running on iOS 5 and your screen has shrunk down to 1/4 of its size, don’t despair because there’s a fix for it.

All you need to do to resolve the 1/4 screen issue is to

-Install SBSettings from your Cydia
-Launch the app and tap on ‘Safe Mode‘

Reboot and the issue should be disappeared.