And he said that the attempts was not successful to untether jailbreak the iPhone 4s because of "processor cache issues". He added that he almost there, however failed to identify what's the problem, but it could be from the Cortex-A9 cache management.
Here is the quotation of his words:
The untether fails right now because I’m having processor cache issues.
I’m close, but I can’t figure out what happens. It certainly has something to do with the Cortex-A9 cache management.
I could sort it out quick, it’s a matter of chance.
I’ll report you my progress tomorrow.