For those of you waiting for an iPhone 4S untethered jailbreak, we’ve got good news and bad news.

The good news is that skilled hacker pod2g is working hard and making definite progress on an iPhone 4S untether. The bad news is that he’s hit a stumbling block on his way to finding a solution…

From pod2g’s blog:

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 multicore cache management.

Update: pod2g has changed the “multicore cache management” statement to the below:

I’m close, but I can’t figure out what happens. It certainly has something to do with the Cortex-A9 cache management.

pod2g says he will have an updated status tomorrow, so there’s no doubt that he’s working mighty diligently to make the 4S untether happen as soon as possible.

As of now, there is no jailbreak — untethered or otherwise — for the iPhone 4S, but we presume it’s only a matter of time before it happens. If you can remember, it took a similar period of months before we had an iPad 2 jailbreak, and this appears to be a similar situation from a time perspective.

Are you optimistic that we could see the iPhone 4S jailbreak before the end of the year?