CoolBooter

CoolBooter

Original author(s)	Jonathan Seals
Developer(s)	Jonathan Seals
Initial release	25 December 2016
Stable release	1.5 / 26 March 2018
Development status	Active
Operating system	iOS
Available in	English
Type	Utilities
License	Freeware
Website	CoolBooter

CoolBooter is a tool for dual booting jailbroken 32-bit iOS devices with another copy of iOS via winocm's ios-kexec-utils. It supports hosts running iOS 7.0 or higher and can boot versions ranging from 5.0 to 10.3.3. Hosts on lower versions can install the CLI version instead.

Usage notes

• During setup, the user can choose to jailbreak the secondary operating system and/or activate verbose boot. iOS 8.x will automatically be jailbroken, as there will be issues if it is not.

• Hosts running iOS 9.0 or higher experienced issues with data protection, meaning that apps such as YouTube, WhatsApp and Mail would not work on the secondary OS. Experimental protected volume support was added later to work around these issues.

• Like regular installations of iOS, dual booted systems must be activated. A6 devices that have ever been on iOS 10 and then downgraded have failed activation since July, 2017, first randomly, then consistently. To activate the dual booted partition on these devices, activation records can be copied to /var/root/Library/Lockdown from the host OS. Another option is to delete /Applications/Setup.app, also done from the host OS.

• iOS 6 as a secondary OS will kernel panic during boot on Lightning adapter devices if the USB cable is attached, or has been since the device was booted into the host OS. To fix the issue, unplug the cable and reboot before launching CoolBooter.

• The secondary OS uses the same lock screen passcode as the host OS, and is protected under the same data-protection scheme as the main OS.

• Prior to version 1.4 (APP), CoolBooter used a kloader version that depended on tfp0. This meant that CoolBooter would not function on h3lix, which does not have tfp0 but instead has hgsp4. Version 1.4 was released a few days after h3lix to add support.

Version Change Log

Version	Date	Changes
1.0b1	25 December, 2016	initial release
1.0b2	25 December, 2016	fixed a small mistake in the booting process
1.0b3	26 December, 2016	7.x support temporarily dropped due to activation issues
1.0b4	27 December, 2016	Solved partitioning issues
1.0b5	28 December, 2016	Adds a warning to reboot after installation
1.0b6	18 April, 2017	Includes fixes for low capacities as well as many performance improvements
1.0b7	9 May, 2017	Adds backup and restore and improves reliability on older firmwares
1.0b8	4 June, 2017	Fewer bootloops, maybe no more bootloops?
1.0b9	5 June, 2017	Including better iOS 7 support
1.0b10	14 June, 2017	iPhone 4s is now fully supported
1.0b11	20 June, 2017	Adds a custom data partition size option
1.0b12	21 July, 2017	Added S5L8942 device (iPadMini 1, iPod5, iPad2,4) support (thanks to @axi0mX)
1.0.1	9 August, 2017	Fixes for the iPad2,4, iPod5,1, as well as bootlogo support (thanks to @nyan_satan)
1.0.2	27 August, 2017	Experimental protected volume support for iOS 9+ main OS users
1.1	11 September, 2017	iOS 8.0–8.4.1 target OS support
1.1.1	12 September, 2017	Bug fixes for iPad mini 1 as well as for iOS 9 main OS users
1.2	24 September, 2017	iOS 5.x support, and stability improvements for A5 devices
1.2.2	29 September, 2017	iOS 8.x bootlogo support, fixed 5.1 targets for iPhone 4S, fixed issues with devices not continuing past Apple logo (iOS 7 and lower) or booting back into host OS
1.2.3	3 October, 2017	Fixes iPhone 4S and iPod Touch 5G iOS 6 support, iPhone 4S iOS 5.1.x support (including baseband), inability to allocate more than 6 GB of space to iOS 5.x
1.2.4	25 October, 2017	General performance improvements, automatic detection of iPhone 4S units that cannot run iOS 5
1.4	27 December, 2017	Support for iOS 10.3.x Support for jailbreaks that enable host_get_special_port/4 and not task_for_pid(0) Custom bootlogo support Resolved an issue where firmware downloads would hang if the user loses their internet connection during a download General performance improvements and various fixes for small issues
1.4.1	29 December, 2017	Fixes a regression in bootloop protection for iOS 7 as a secondary OS
1.5	26 March, 2018	iOS 9.0 -> 9.3.5 secondary OS support. iOS 10.0.1 -> 10.3.3 secondary OS support. Resolved an issue on lightning devices where a panic would happen upon booting iOS 6 if a cable was attached during the prior boot. Resolved an issue on A5 and A5X devices that caused panics upon booting the other OS. Resolved an issue where iOS 10 main OS users booting iOS 8 as a secondary OS would have no baseband.

CoolBooterCLI

CoolBooterCLI

Original author(s)	Jonathan Seals
Developer(s)	Jonathan Seals
Initial release	9 March 2017
Stable release	1.0 / 26 March 2018
Development status	Active
Operating system	iOS
Available in	English
Type	Utilities
License	Freeware
Website	CoolBooter

A command line interface version called CoolBooterCLI is offered as a separate package in Cydia. Originally requiring iOS 6.0 or higher, it now runs on iOS 5.x as well.

Starting CoolBooterCLI from MTerminal using the command coolbootercli -b fails on devices running older iOS versions. This issue can be solved by starting CoolBooterCLI via SSH instead (ssh root@localhost) or by using an app that spawns "coolbootercli -b".

Version Change Log

Version	Date	Changes
0.1.4	9 March, 2017	Initial release, supports hosts on 6.0 and higher, targets 6.0–7.1.2 on same devices as before
0.3	18 April, 2017	Adds support for iOS 5 hosts and targets, iPod 4G, iPhone 3GS, iPad 1, low capacity improvements
0.6	17 June, 2017	iPhone 4S support, more stability, and a custom data partition size option
0.8.2	29 September, 2017	Added support for S5L8942 devices, support for 5.x and 8.x targets, experimental protected volume support for hosts on iOS 9 or later going to iOS 7 or lower (use option --use-dpw), protected volume support for all devices running iOS 8 or lower, bootlogo support for all target versions
0.8.3	3 October, 2017	Fixes iPhone 4S and iPod Touch 5G iOS 6 support, iPhone 4S iOS 5.1.x support (including baseband), inability to allocate more than 6 GB of space to iOS 5.x
0.8.4	25 October, 2017	General performance improvements, automatic detection of iPhone 4S units that cannot run iOS 5
1.0	26 March, 2018	iOS 9.0 -> 9.3.5 secondary OS support. iOS 10.0.1 -> 10.3.3 secondary OS support. Resolved an issue on lightning devices where a panic would happen upon booting iOS 6 if a cable was attached during the prior boot. Resolved an issue on A5 and A5X devices that caused panics upon booting the other OS. Added support for jailbreaks that enable host_get_special_port/4 and not task_for_pid/0.

CoolBooter Untetherer

CoolBooter Untetherer

Original author(s)	Trevor Schmitt, Jonathan Seals
Developer(s)	Trevor Schmitt, Jonathan Seals
Initial release	26 March 2018
Stable release	1.0 / 26 March 2018
Development status	Active
Operating system	iOS
Available in	English
Type	Utilities
License	Freeware
Website	CoolBooter

CoolBooter Untetherer allows the user to "untether" their dual boot by allowing the user to boot directly into the installed secondary OS upon startup without any interaction from the user. The untetherer does not support semi-untethered jailbreaks such as Phœnix or h3lix, therefore iOS 9.3.5 and iOS 10.0.1-10.3.3 are not supported as the user's main OS. To disable the untetherer, the user must hold the volume down button on their device until their main OS lockscreen shows.

Version	Date	Changes
1.0	26 March, 2018	Initial release

External Links

• Official website and Cydia repository
• @CoolBooter on Twitter