iPhone Dev team released a new version of Redsn0w v0.9.15b1 to jailbreak iOS 6 tethered on iPhone, iPad or iPod touch. Redsn0w v0.9.15b1 also allow users to downgrade to unsupported firmware as long as you have saved SHSH Blobs.
With RedSn0w v0.9.15b1 users can jailbreak A4 iDevices tethered jailbreak on iOS 6 and untethered jailbreak on iPhone 3GS running iOS 6.
The complete change logs and release notes are available on iPhone Dev Team Blog:
Today we’re pleased to release redsn0w version 0.9.15b1, with significant new features supporting restoring to older firmware no longer being signed by Apple. For brevity, we’ll list most of the new features in bullet form.
First, the high-level new feature list:
restore from any 5.x iOS to any other (up, down or the same) 5.x iOS on all devices as long as you have the correct blobs (see more below)
Cydia now included in the tethered 6.0 jailbreak on A4 devices
automatically “Just Boot” tethered when qualifying A4 device connects in DFU mode
untethered 6.0 jailbreak on old-bootrom 3GS
untethered 6.0 hactivation on any 3GS or iPhone4
directly restore pre-A5 devices to earlier firmware — no more complicated 15-step how-to’s with stitching, iTunes errors, and “hosts file” concerns
fetch new signed blobs for any IPSW (present or future — no redsn0w update required) using Extras->SHSH Blobs->New
block the BB update for any 3GS or iPhone4 restore (past, present, or future — no redsn0w update required) using Extras->Even More->Restore
deactivate any iPhone, useful for testing your “official” unlock status through iTunes. (Please only deactivate your own iPhone!)
activation status shown on “Even more” page
significantly more (very nerdy) info returned by “Identify” button when device is in Normal mode
tethered jailbreak of ATV2 supported (but the only thing available for it is the SSH2 custom bundle available here — no Cydia yet. Must use “Select IPSW” for tethered boot of ATV2 for now).
auto-exit WTF mode for older devices with broken buttons
any time a set of blobs is fetched remotely (from Apple or Cydia), redsn0w also saves them locally (and will check there first if you click “Local”)
for your future restoring convenience, you should also submit all of your past and present TinyUmbrella blobs to Cydia if you haven’t done so yet. Resubmitting is okay and won’t cause conflicts.
Download RedSn0w v0.9.15b1 To Jailbreak iOS 6 Tethered, Allows Downgrade To Unsupported Firmwares
Download RedSn0w v0.9.15b1 for Windows Download RedS n0w v0.9.15b1 for Mac OS X
Download Redsn0w v0.9.15b2 For Windows
Download Redsn0w v0.9.15b2 For Mac
Download Redsn0w 0.9.15b3 for Windows
Download Redsn0w 0.9.15b3 for Mac