Earlier this month, famed jailbreak hacker iH8sn0w has released iFaith 1.4 which enabled users to save SHSH blobs for iOS 5.0 and iOS 5 making it possible to downgrade to the said firmware in the future. iFaith 1.4 also saves your device's APTickets as well which is a new check performed by Apple to ensure that everyone is on the latest released firmware. Now iH8sn0w has released yet another updated version of iFaith.
The version dubbed iFaith 1.4.1 has just been made available for download by iH8sn0w, it contains a variety of fixes that makes the program more stable. For one it has resolved some issues that rarely occurs with DFU detection. Another one that was resolved in this version was the issue with 8GB iPhone 4 models. The change log for iFaith v1.4.1 is below:
iFaith v1.4.1 Release Notes:
* Added Apple TV 4.4.4 (9A406a) support.
* TinyUmbrella iOS 4.4.x/5.x.x blobs are now accepted.
* Resolved rare DFU detection issues.
* Resolved issues with 8GB iPhone 4 Models.
* Resolved iPhone 3GS issues with factory certificates/Error 21 that occurred during restore.
* Resolved iOS Detection issues.
* Removed kill-switch that accidentally got distributed in iFaith-v1.4's public release.
* Don't expect A5 device support until a DFU bootrom exploit is publicly available.
Interestingly, you can now also use iFaith to make custom firmware from blobs that was saved using TinyUmbrella. However, for the sake of compatibility and to prevent any sort of issues, we recommend that you only use blob files and APTickets saved by iFaith. Although you can also choose to use the latest version of Redsn0w 0.9.9b9b to cook custom iOS 5.0 and iOS 5.0.1 IPSWs (now available in the Windows version of Redsn0w as well) with SHSH blobs and APTickets saved by TinyUmbrella. So just use whatever suits you best.
Keep in mind that iFaith is only available for Windows, so if you are a Mac user, you can use Redsn0w and TinyUmbrella instead since both are multiplatform. Also, this version doesn't work with A5 devices such as the iPhone 4S and iPad 2.
If you are currently in iOS 5.0 and iOS 5.0.1, it would be wise to save your SHSH blobs + APTickets now using iFaith. The upcoming untethered jailbreak has been proven to work with both iOS 5.0 and iOS 5.0.1, thanks to pod2g. So if Apple drops iOS 5.1 officially, it goes without saying that you shouldn't update your device unless you don't care about jailbreaking of course.