Not even 24 hours after Apple announces and releases iOS 5.1 to the public, the iPhone Dev-Team has already updated redsn0w to version 0.9.10b6 to support a TETHERED jailbreak for non-A5 device owners running iOS 5.1. Old bootrom iPhone 3GS models will still have the untethered jailbreak; iPad 2 and iPhone 4S owners will not be able to jailbreak at iOS 5.1 and there will be no way for them to downgrade back to iOS 5.0 or iOS 5.0.1 once Apple stops signing the iOS 5.0.1 firmware.
Redsn0w 0.9.10b6 still supports the untethered jailbreak for iOS 5.0 and iOS 5.0.1 – there is no rush to update. In fact, in a recent blog post by the iPhone-Dev Team dubbed March Mayhem, you are advised to avoid upgrading to iOS 5.1 completely until an untethered jailbreak can be created. If you feel like a jailbreak is unimportant compared to being able to use iPhoto, delete photos from Photo Stream, and having an always existent camera slider on your lock screen, then you can update if you like; nothing groundbreaking was released in iOS 5.1.
Because redsn0w 0.9.10b6 is a tethered jailbreak for non-A5 devices, you will need to ‘boot tethered’ every time you attempt to turn on or reboot your iDevice after you have applied the tethered jailbreak. The iPhone Dev-Team warns anyone relying on an unlock that wants to install iOS 5.1 and perform the tethered jailbreak to make a custom .ISPW file with the NO_BB_* version of iOS 5.1 to restore to. They say ultrasn0w will be updated in the next couple of days to support it.
An iBooks fix is not existent in the iOS 5.1 tethered jailbreak, so if you rely on iBooks for your purchased content then this is another reason to stay away from iOS 5.1. A future version of redsn0w has been cited to contain a fix for iBooks. The full iPhone Dev-Team update below:
Originally Posted by iPhone Dev-Team
Here are the download links for redsn0w 0.9.10b6:
Mac OS X
Windows (Run in administrator mode)
Sources: iPhone Dev-Team