I am going to assume you are on iOS 5.x.x, in which case, that would suck. Immensely. If not, then follow this nifty guide. Done it a few times myself.Is it possible to UN-Jailbreak my iPhone 4 without restoring it.I dont want to restore it to the latest version as im waiting for an untethered JB for iOS 5.0.
Won't work apple stopped signing 5.0 he can try IFaith but that is no garentee.I am going to assume you are on iOS 5.x.x, in which case, that would suck. Immensely. If not, then follow this nifty guide. Done it a few times myself.
Step 1: Back up your phone.
Step 2: Download TinyUmbrella. (http://thefirmwareumbrella.blogspot.com/)
Step 3: Back up your SHSH blobs. (http://lastplaceonthe.net/backup-shsh-blobs-tinyumbrella/)
Step 4: Use TinyUmbrella to bypass auth requestes from iTunes to apple.
Step 5: Restore your iPhone with the version of firmware you previously had on it.
Step 6: Move all your junk back onto iPhone from backup in step 1.
It says its used for 4.3.3, but the process is basically the same for any version of iOS except iOS 5.x.x.