iPhone 4S Untethered Jailbreak Progresses as Pod2g Solves A5 Cache Issue
Earlier this morning, pod2g updated his blog to notify users he had run into cache issues with the A5 chip (now made in Texas!) within the iPhone 4S he was testing out on the weekend. Just this afternoon, he has published another update to tell us he has solved that cache issue, and also received some help from Cydia founder, Saurik, to implement a stable untethered iOS 5 jailbreak:
OK, figured it out, the A5 cache is not a problem anymore.
I sorted it out by doing the untether in a single thread and by flushing all the dcache then all the icache in a row at a strategical point of the process.
It took me like a hundred of tests to find the key. Hard for the nerves.
For the tech guys, here is a link explaining issues related to self modifying code ( or code patching ) on the ARM platform : http://blogs.arm.com/software-enablement/141-caches-and-self-modifying-code/
Another news : I discussed with @saurik today about the launchd boot process, and he’s found one missing piece of the puzzle I needed to have a perfectly stable jailbreak. He’s definitly one of the best iOS gurus out there. Thank you saurik!
This is awesome news, and kudos to @pod2g for his amazing work for the jailbreak community.