The iPhone-Dev Team announced Sunday that it had updated the popular jailbreak utility Redsn0w to version 0.9.15b1 with a number of key features including the ones supporting restoring to older firmware, no longer being signed by Apple.

Following Sunday’s announcement, the iPhone-Dev Team came up with yet another update to Redsn0w on Monday, taking the version to 0.9.15b2. As per the announcement, the version of Redsn0w includes some key fixes for owners of older iOS devices.

The most significant fix brought by Redsn0w 0.9.15b2 is for the owners of iPhone 3GS with old bootroms. The new version includes the untethered jailbreak support for 3GS users that come under that category.

Here’s what the iPhone-Dev Team’s official blog said:

Update #1 (Oct 15): Version 0.9.15b2 fixes a few issues for 3GS owners: old-bootrom awesomeness is no longer forgotten directly after a restore, and iPad baseband upgrade/downgrade support is fixed (same production date cutoffs apply!).  If your 3GS is currently tethered at 6.0 even though you have an old bootrom, just re-run redsn0w’s Jailbreak step (no need to restore).  Don’t forget you can add some pizzaz with your own boot logo or a nerdy verbose boot.”

If you have an old bootrom iPhone 3GS with a tethered jailbreak, all you have to is re-jailbreak the device with Redsn0w 0.9.15b2 to get back the untethered jailbreak. Click here for a step-by-step guide to perform the jailbreak.

As reported earlier, one of the exciting features of the updated Redsn0w is the new direct restore option for pre-A5 devices that lets you downgrade the device from iOS 6 to any iOS 5.x firmware without dealing with host files, stitching, Pwned DFU, iTunes or any other complications that made the downgrading process difficult in the past.

Here are the steps, provided by iDownloadBlog, to use this new restoring feature of Redsn0w. But before going ahead, you must be aware of the following aspects:

- SHSH blobs must be saved either locally or on Cydia for the firmware the user wants to downgrade to.

- These steps are applicable to pre-A5 devices, not other devices like iPad 2, iPhone 4S and newer.

Step 1: Download RedSn0w 0.9.15b2. (Mac / Windows)

Step 2: Connect the iOS device and place it into DFU mode.

Step 3: Once RedSn0w detects the device in DFU mode at the bottom of the main RedSn0w page. Click Extras > Even more > Restore > IPSW, and select the IPSW firmware file that you want to restore to (If you don’t have the right firmware file on your machine, you can download firmware files from here). Now RedSn0w should process the IPSW file.

Step 4: After the IPSW is processed and identified, you will be asked to preserve your baseband. In case you are on an unlockable baseband and you rely on UltraSn0w or a SIM interposer for an unlock, you may want to do that.

Step 5: Now, you need to locate your SHSH blobs. If the SHSH blobs aren’t local, you haven’t fetched your blobs or performed this restore before. You will most likely need to click the Remote option to get the necessary blobs from Cydia fetched.

Step 6: After selecting the blobs, the restore process should begin, and you will be restored to the firmware you selected.

In case you receive an error saying “Couldn’t restore Mismatched APTicket,” your device will be out of the DFU mode and the restore process will stop. But no need to panic, simply put the device into DFU mode again and repeat the third step. The restore should start again from there.

Check the video below: