Uploaded June 2016 | Updated September 2026, 8 hours ago

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A tutorial about how to implement an untethered iOS Multi-Boot is available here,
pmbonneau.com/apple/ios/multiboot.php.

Patches for iPod Touch 4 iOS 5.1 bootchain are available to download here, pmbonneau.com/apple/ios/multiboot_patches.php.

For this video, I implemented an untethered iOS 6.1.6 and iOS 5.1 dual boot on my iPod Touch 4 (N81AP). This is mostly an update of youtube.com/watch?v=JEyiftFmmX0, uploaded last summer. This was the first semi-tethered dual boot I made.

For an untethered dual boot, 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. In this video, kloader worked four times and it crashed about three times.

When I launch the iOS 5 bootstrap application, the device (should) execute the LLB (Low-Level Bootloader) file set in the script which will execute 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.

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) Ahrix - Nova [NCS Release]
youtube.com/watch?v=FjNdYp2gXRY