Uploaded March 2016 | Updated September 2026, 3 days ago
For this video, I implemented an untethered triple boot involving iOS 7.1.2, iOS 6.1.3 and iOS 5.1.1 on my iPhone 4 (N90AP).
I wrote a tutorial about how to implement an untethered iOS Multi-Boot here,
pmbonneau.com/apple/ios/multiboot.php.
It's a testing version, currently only supports iOS 7.1.2 and 6.1.6 on iPhone 4 (N90AP).
The iOS device normally do a signed boot to iOS 7.1.2 untethered jailbroken at userland level. I resized the data partition, then I created four new partitions (system, data for iOS 6 and system, data for iOS 5). I formatted new partitions in HFS+ volumes, then I mounted them. Into those new volumes, I copied the content from respective file system .dmg images. I did adjustements to the fstab and fixed that kb_load() fatal error (incompatible system keybag format between iOS 7.1.2 and older). The iOS 6 and iOS 5 bootstrap applications I made are only a script launcher. There is a system() call with the command line to execute as argument. Something like system("Bootstrap.sh"), where Bootstrap.sh is a script stored in /bin. The script only launches kloader with the unsigned bootloader image to bootstrap. When I launch a bootstrap application, the device (should) execute the LLB (Low-Level Bootloader) file set in the script which will execute the appropriate iOS specific iBoot (second stage bootloader), which will display the classic apple logo, load the devicetree and boot the kernel with the boot-args (verbose boot, root device and so) set in the appropriate string.
The whole bootchain of a subsequent operating system does chainload untethered when kloader successfully executed the first stage bootloader (LLB).
Kloader tends to crash around one time on two, depending on many factors.
Please note that this video is a demonstration, not really a tutorial. Set up a dual-boot like this one can take few hours, depending on many technological factors.
Special thanks to @xerub, @iH8Sn0w and @JonathanSeals for many advices to help me solve some problems I encountered during the multi-boot implementation.
The soundtrack of this video is a mix made by me with the following tracks :
A) Jim Yosef - Eclipse [NCS Release]
youtube.com/watch?v=1WP_YLn1D1c
B) Different Heaven - Nekozilla [NCS Release], youtube.com/watch?v=6FNHe3kf8_s
C) Jim Yosef - Firefly [NCS Release],
youtube.com/watch?v=x_OwcYTNbHs
D) Unison - Aperture [NCS Release],
youtube.com/watch?v=8VDjPYcL-oU
E) Tobu - Candyland [NCS Release]
youtube.com/watch?v=IIrCDAV3EgI
F) Spektrem - Shine [NCS Release]
youtube.com/watch?v=n4tK7LYFxI0
G) Spektrem - Shine (Gabriel Drew & Bloom Remix) [NCS Release]
youtube.com/watch?v=rWVjht-MIto
H) Itro & Tobu - Cloud 9 [NCS Release]
youtube.com/watch?v=VtKbiyyVZks
I) Spektrem - Shine [NCS Release]
youtube.com/watch?v=n4tK7LYFxI0
J) Jim Yosef - Lights [NCS Release]
youtube.com/watch?v=vb3ks4WllXA
K) Ahrix - Nova [NCS Release]
youtube.com/watch?v=FjNdYp2gXRY
For this video, I implemented an untethered triple boot involving iOS 7.1.2, iOS 6.1.3 and iOS 5.1.1 on my iPhone 4 (N90AP).
I wrote a tutorial about how to implement an untethered iOS Multi-Boot here,
pmbonneau.com/apple/ios/multiboot.php.
It's a testing version, currently only supports iOS 7.1.2 and 6.1.6 on iPhone 4 (N90AP).
The iOS device normally do a signed boot to iOS 7.1.2 untethered jailbroken at userland level. I resized the data partition, then I created four new partitions (system, data for iOS 6 and system, data for iOS 5). I formatted new partitions in HFS+ volumes, then I mounted them. Into those new volumes, I copied the content from respective file system .dmg images. I did adjustements to the fstab and fixed that kb_load() fatal error (incompatible system keybag format between iOS 7.1.2 and older). The iOS 6 and iOS 5 bootstrap applications I made are only a script launcher. There is a system() call with the command line to execute as argument. Something like system("Bootstrap.sh"), where Bootstrap.sh is a script stored in /bin. The script only launches kloader with the unsigned bootloader image to bootstrap. When I launch a bootstrap application, the device (should) execute the LLB (Low-Level Bootloader) file set in the script which will execute the appropriate iOS specific iBoot (second stage bootloader), which will display the classic apple logo, load the devicetree and boot the kernel with the boot-args (verbose boot, root device and so) set in the appropriate string.
The whole bootchain of a subsequent operating system does chainload untethered when kloader successfully executed the first stage bootloader (LLB).
Kloader tends to crash around one time on two, depending on many factors.
Please note that this video is a demonstration, not really a tutorial. Set up a dual-boot like this one can take few hours, depending on many technological factors.
Special thanks to @xerub, @iH8Sn0w and @JonathanSeals for many advices to help me solve some problems I encountered during the multi-boot implementation.
The soundtrack of this video is a mix made by me with the following tracks :
A) Jim Yosef - Eclipse [NCS Release]
youtube.com/watch?v=1WP_YLn1D1c
B) Different Heaven - Nekozilla [NCS Release], youtube.com/watch?v=6FNHe3kf8_s
C) Jim Yosef - Firefly [NCS Release],
youtube.com/watch?v=x_OwcYTNbHs
D) Unison - Aperture [NCS Release],
youtube.com/watch?v=8VDjPYcL-oU
E) Tobu - Candyland [NCS Release]
youtube.com/watch?v=IIrCDAV3EgI
F) Spektrem - Shine [NCS Release]
youtube.com/watch?v=n4tK7LYFxI0
G) Spektrem - Shine (Gabriel Drew & Bloom Remix) [NCS Release]
youtube.com/watch?v=rWVjht-MIto
H) Itro & Tobu - Cloud 9 [NCS Release]
youtube.com/watch?v=VtKbiyyVZks
I) Spektrem - Shine [NCS Release]
youtube.com/watch?v=n4tK7LYFxI0
J) Jim Yosef - Lights [NCS Release]
youtube.com/watch?v=vb3ks4WllXA
K) Ahrix - Nova [NCS Release]
youtube.com/watch?v=FjNdYp2gXRY
