Dual-booted an iPhone 5s with iOS 10.3.3 (14G60) as the main, and 11.0 (15A372) secondary OS. Each version uses its own unique data partition, which is native to an iOS install.
Fixed baseband and Touch ID on 64bit dual boots!
Successful dual boot of iOS 13.3 (17C54) main and 13.0 (17A577) secondary on iPhone 8 (d201ap)
Haptics, biometrics, and baseband are all fully functioning.
Sundance 10A234
Internal iOS 6.0 build dating to February 2012
This version is so early that there are little differences between iOS 5
Compiled for iPhone 4 (N90)
TellurideNanshan9A2306f.H4DesenseOS
iOS 5.0 (Internal UI) Installed on a production iPhone 4S:
This build seems to supports any device that can run iOS 5 (even iPods and iPads) unlike most older internal iOS UI builds, which are only compatible with the matching device.
iBoot for n82ap, Copyright 2007
BUILD_TAG: iBoot-253
Diagnostics in this build date to January 2008
This iBoot is essentially iOS 1.x for the iPhone 3G
No display and no NAND when flashed on a production unit
TellurideNanshan9A2264r
Usually found on DVTs, this is an early build of 5.0 - Interestingly it seems to have a UI similar to 4.x builds, and features XInternalApps, which is known to be removed with 5.1.
Upon boot, the system immediately recognizes the baseband failure (some oddity that seems to happen on iOS 13.x dual boots), and prints an interesting message:
The dual boot guide has been updated to add notes for fixing baseband/Touch ID.
There has also been a small rewrite. Hopefully this will be a little more beginner friendly and clarify details that may have been missing before.
Check it out at
SundanceTaosTianshan10A63971b.iPadFactoryOS
Unlike earlier versions of 6.0, it seems to have a display dimming function. Perhaps this was added in later towards the release.
It should be noted that the “Show Internal Apps” toggle in internal settings allows the rest of the apps present in /AppleInternal/Applications to be shown:
InnsbruckTianshan11A63840h
Given that this only dates three weeks before 11A93840l, and little to no differences in structure, it is safe to assume that the latter is merely a bug fix release.
SundanceNanshan10A23110z
Found on an iPhone 5 PVT (production verification testing) unit, this build is slightly newer than Sundance 10A316, contrary to what the build number may suggest.
iBoot-3319.0.0.1.9 for d11 (iPhone 7 Plus), dating before iOS 10.0 beta 1
This iBoot is so early that LLB and iBoot were separated into iBootStage1 and iBootStage2. Based on the system, this dates to April 2016.
Here are a few screenshots of diagnostic utilities Apple included on SpringBoard: AGX Reporter, Siri Debug, as well as Tap to Radar. (There are many more hidden apps in the /AppleInternal/Applications directory)