Great news for developers! Apple has introduced both Apple new products iOS beta 4 and iTunes 10.5 beta 4. For non-developer Apple has given direct links to download iTunes 10.5 beta 4 on Windows and Mac without any charges.
Beta software and firmware are not for non-developer. Don’t upgrade your device to beta firmware if you don’t know what you are going to do.
If you still want to get beta firmware and software then you must sure about drawbacks that you will face after installing them.
You have to re-sync all your photos with iTunes when you will start to upgrade iTunes 10.5 beta 3 to new version iTunes 10.5 beta 4.
For those who are using Wireless sync with Mac computer, make sure that before using Sync between iOS device and iTunes you have to download iTunes 10.5 beta 4 and then upgrade to new version.
You can download iTunes 10.5 beta 4 for Windows and MAC directly from links given below
Link for iTunes 10.5 beta 4 for Mac:
Link for iTunes 10.5 beta 4 for Windows 64-bit