If you want a semi-thered jailbreak on i OS 5, you should install the Semi Tether patch from Cydia.
And those of you who are running i OS 5.0.1 can use Redsn0w or Ac1d Sn0w to get a tethered jailbreak.
This means that you can now feel free update your Apple devices supporting the A4 System-on-Chip design to the latest firmware.
It is unknown yet whether the exploit will work on Apple’s devices with a dual-core A5 chip like the i Pad 2 or the latest i Phone 4S.
At the moment, i OS 5 can be tethered jailbroken using Redsn0w, Ac1d Sn0w or Sn0wbreeze.
December 20th, 2011 A few days back, Chronic Dev Team member an i OS hacker Pod2g revealed a new untethered jailbreak solution for i OS 5.
He tested it on a third generation i Pod Touch running the 5.0 i OS software, but was not sure if it would be able to jailbreak the latest i OS 5.0.1 as well.
It is worth noting, however, that the solution that Pod2g developed confirmed to be effective only for i Phones, and i Pads equipped with an A4 processor like the first-gen i Pad, i Phone 3GS, i Phone 4, and Apple TV.
i Phone owners who rely on the Ultrasn0w unlock still should be cautious with upgrading to retain the unlockable baseband.
November 22th, 2011 Unfortunately, as most of you have experienced firsthand, unlocking a brand new i Phone is not an easy task.
A few years back, when the i Phone just came out, software unlocking was much simpler and there was no need to ask the carrier to unlock the i Phone or use the GEVEY card with the dubious legal status.
But, as it turns out, the new exploit is effective for i OS 5.0.1.
The hacker tested the exploit on his i Phone 4 with the final i OS version and posted a happy tweet to share the news with the world.
But it seems that the situation with the freshest Apple smartphone, the i Phone 4S, is different.