IOS 6.1.3 iTunes Sync Problem?

I have a iPhone 4S 64gb v6.1.3. I installed many apps from itunes. But when i installed apps with kuaiyong. Now i'm unable to sync or copy anything with my itunes on my computer.

There have been many issues with 6.1.3, you can downgrade off this website:

http://www.redmondpie.com/download-ios-6.1.3-final-for-iphone-ipad-ipod-touch-direct-links/

If you want to downgrade download the software for your appropriate device from the list above and then connect your device to iTunes. Hold option while clicking on "Check for Update" and then select the downloaded file.

  • Songs in itunes won't sync to ipod but will sync to iphone? So i have over a 1000 songs in my itunes library and they will all sync to my iphone no problem. But when i try to sync to my ipad (which has enough memory available) it will not.
  • Music won't sync to iphone when i sync itunes? I plug my iphone 4 into my computer, and sync my itunes stuff. It syncs the contacts, calendars, apps, everything except my music.
  • Itunes problem not able to sync apps? I have the latest itunes 11.0.1.In the apps section of my iphone 5 i had 90 apps but due to virus problem i had to format my computer now i shows only 5 apps on the apps section of itunes while my iphone still have have 80 apps i'm not able to sync them to the itunes apps section… Any ideas how to sync the remaining apps on itunes
  • ITunes help? ITunes purchases won't sync with iphone? So I have an item (an radio show-aka a "song") that shows up in my itunes as purchased, but if I go onto my phone it doesn't say that: It just tells me how much it is like I have not purchased it. I've checked in my purchased files, and it's not there on my phone. I can't sync my phone to my itunes at the moment… Is there any way to get that item onto my phone? Would re-buying it actually charge me?