Save SHSH. iFaith is the feature that helps to preserve your ability to downgrade firmware by saving SHSH blobs of your device just like TinyUmbrella.
Before you ask; Yes a solution for the 5.x firmware nonce is being investigated… None of us have a working solution yet though. Hang tight.
I have a couple trails and ideas I am trying out for 4.x baseband based restores to avoid 10xx errors. Until then save your signatures as you will never know when they may come in handy…
SAVE SHSH FILE
TinyUmbrella is a unified version of Firmware Umbrella and TinyTSS.
If you jailbreak your iPhone/iPod Touch or want to do so in near future, it’s a good idea to save SHSH blobs for iOS 4.3.3 to secure future jailbreak.