CoolBooter is an all-in-one dual booting utility for jailbroken 32 bit iOS devices, provided completely free of charge.
CoolBooter allows you to dual-boot another iOS with your current jailbroken iOS firmware.
CoolBooter modifies your device's partitions. This is dangerous, but required.
Please back your device up, and do not use a device that you would mind restoring to the latest available firmware.
CoolBooter currently supports going from any jailbroken iOS to iOS 6, on the iPhone 4, iPhone 5, iPad 2, iPad 3, and iPad 4.
CoolBooter is available by adding https://coolbooter.com to your sources in Cydia.
Follow @CoolBooter on Twitter for updates, and for support, simply send a direct message, or email email@example.com.
CoolBooter is a utility created by Jonathan Seals, and was made possible by winocm, Rod Smith, danzatt, xerub, and the iphone-dataprotection project.
CoolBooter Partitioner (messy gptfdisk fork) source