From owner-freebsd-arm@freebsd.org  Mon May 14 17:17:29 2018
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Date: Mon, 14 May 2018 20:17:10 +0300
From: Greg V <greg@unrelenting.technology>
Subject: Re: Thanks, iOS v4-v5 Full Rom Files?
To: ken olson <kenitholson@yahoo.com>
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On Mon, May 14, 2018 at 6:32 PM, ken olson via freebsd-arm 
<freebsd-arm@freebsd.org> wrote:
> Hi Johannes,
> Thanks for your comments!
> Since posting have been searching for postings of Open OSes on 32 bit 
> Apple Mobile Devices.
> While have found things like "Dual-Boot Android on Your iPhone"  
> https://ios.gadgethacks.com/how-to/exclusive-dual-boot-android-your-iphone-ios-7-0161123/ 
>  closer exam reveals "Thanks for having some fun with us this April 
> Fool's Day! We hope you all enjoyed this as much as we had coming up 
> with it. If and when something like this becomes a reality, we'll 
> have your step-by-step guide ready at AppleHacks.com."

Hi,

While your 4S is too new, there were (non-April-Fool) attempts at 
booting custom OSes on the iPhone 4, original iPad and older devices.

https://github.com/iDroid-Project/openiBoot
https://en.wikipedia.org/wiki/OpeniBoot
https://www.youtube.com/watch?v=UIixUYaLufo
https://github.com/postmarketOS/pmbootstrap/issues/57

Sadly, this is all very abandoned, there is not much interest in these 
devices.