Dual-Boot UNTETHERED with CoolBooter 1.0 Download. With the new Coolbooter Untethered package, you can boot directly into the secondary iOS when the phone powers on, without having to first boot iOS 8, 9 or 10 to be able to get to iOS 6 for example. Switching back to the primary iOS version is done by pressing and holding the Volume DOWN button at boot-time until you see the lock screen of the primary.
COOLBOOTER UPDATE 1.0 version
CoolBooter only works on 32-Bit devices: cydia repo: https://coolbooter.com
CoolBooter is an all-in-one dual booting utility for jailbroken 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 any jailbroken iOS to an iOS firmware of your choice on the iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPad 2, iPad 3, iPad 4, iPad Mini 1G, and iPod Touch 5G.
Download CoolBooter by adding this repo sources in Cydia