iTunes cant verify application signature-help

[JoeSchmoe]

I get an error about itunes unable to verify the apps signature. this happens to about 80-90 some odd apps i'm trying to install from a recent backup. I had to get a new phone due to a broken power button so while I had my old 4.1 iphone 4 jailbroken, I knew replacing it was going to lose that. This is fine with me, as we know a 4.2.1 jb isn't far off. So anyway, I get my new phone, get home to try to restore to my most recent backup, and while everything seems fine, after it tries to install all my apps, I get that error. So I thought, maybe my backup is corrupted, I restored as a new phone and it gets the SAME error. which I find realllly odd.

If I go find the app in the appstore, it installs just fine. Its only my itunes versions. Its very bizzare. But i'm not about to try to install all those apps by hand.

Why would this happen? Or, what would cause this?

[seann33uk]

just make a list of all apps you want, delete them from itunes and redownload. Sounds like they're all corrupt.

[JoeSchmoe]

That's soo many, that's sort of my last resort. If I jailbreak, will it allow me to reinstall these? Since jailbreak allows the installation of unsigned code...

[JoeSchmoe]

So now that gp is out, I jailbroke 4.2.1, added app sync 4.0+and voila. I also want to point out, I pirated NON of these apps and even free appstore apps had this issue. so obviously its an issue with apple/itunes signing these apps installation or something? I'm really annoyed because I know if I upgrade or restore, non of these apps will work unless I am jailbroken with appsync installed.