iMore

I have a 32GB iPhone 3GS, version> 3.1.2 (7D11), model> MC133C, week> 42, firmware> 05.11.07. I used Blackra1n & have a tethered jailbreak. Everything works perfectly, I followed all instructions & investigated for days before I performed jailbreak. All went perfect, fast & easy, I did everything correct from changing root passwords, storing SHSH hashes with Cydia & on. I do not care about upgrading to 3.1.3 & I had iTunes working perfectly, with updates turned off. I was cleaning up computer & deleted some files needed for iTunes like app helper & mobileme. Now my iTunes will not open, I restored computer to before I deleted programs & still iTunes won't open. I clicked apple updater & it said iTunes 9.0.3 available & Quicktime had updates, so I installed them & still nothing. I ran iTunes 9.0.2.25 installer pack & clicked to repair, then ran QuickTime 7.65.17.80 installer & also clicked to repair, still won't start. After iTunes won't start i get pop-up that says "The iTunes application could not be opened. An unknown error occured. (-50)" before I make any immediate decisions, does anyone have suggestions to repair iTunes? Sorry this was so long, I hope you stuck with it. Any help would be much appreciated!