I have a Iphone 3G 4.2.1 jailbroken on Redsn0w and installed a few apps from cydia and all of a sudden it's stuck on Safe Mode even I reboot the device. How can I fix this and go back to normal mode.
Start uninstalling Cydia apps in reverse order--whatever you installed last, uninstall first, then reboot. Repeat until the problem goes away and you'll know which one of them is causing the Safe Mode problem.