If you have iPhone 4 CDMA version, you may see the alert “iTunes could not check for an update to the carrier settings for your iPhone. An unknown error occurred (1651)” if you are using iTunes 10.1.1 or earlier.

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If you have iPhone 4 CDMA version, you may see the alert “iTunes could not check for an update to the carrier settings for your iPhone. An unknown error occurred (1651)” if you are using iTunes 10.1.1 or earlier.


Download the latest and the newest iTunes software for Windows (PC) –both 32-bit and 64-bit version– and Mac (Mac OS). All iTunes download links are official direct download links from Apple.
http://iphoners.org/download-itunes-10.2.1-direct-link/
Minimum requirements for iTunes.
Windows Hardware
* A PC with a 1GHz Intel or AMD processor
* Intel Pentium D or faster processor is required to play Standard Definition video from the iTunes Store
* 2.0GHz Intel Core 2 Duo or faster processor is required to play HD video, an iTunes LP, or iTunes Extras from the iTunes Store
* 512MB of RAM; 1GB is required to play HD video, an iTunes LP, or iTunes Extras
* Screen resolution of 1024×768 or greater; 1280×800 or greater is required to play an iTunes LP or iTunes Extras
* DirectX 9.0-compatible video card with 32MB of video RAM; 64MB recommended
* QuickTime-compatible audio card
* Broadband Internet connection to use the iTunes Store
* iTunes-compatible CD or DVD recorder to create audio CDs, MP3 CDs, or back-up CDs or DVDs
Windows Software
* Windows XP Service Pack 2 or later, 32-bit editions of Windows Vista, or 32-bit editions of Windows 7
* 64-bit editions of Windows Vista or Windows 7 require the iTunes 64-bit installer
* QuickTime 7.6.6 or later is required (included)
* 200MB of available disk space
* Screen reader support requires Window-Eyes 7.1.1 or later; for information about accessibility in iTunes, visit www.apple.com/accessibility
How-to Fix An Unknown Error 3194 while restoring (or downgrading) iPhone firmware. iTunes will not let you restore the device using any older firmware than current release unless you have ECID SHSH Blobs enable.

The iPhone “iPhone” could not be restored. An unknown error occurred (3194).
This is the complete log information from %AppData%\Roaming\Apple Computer\iTunes\iPhone Updater Logs
[click to continue…]
Download iTunes 10.1.2.17 direct link from Apple.com

* Version: 10.1.2
* Post Date: January 27, 2011
* Download ID: DL1103
* File Size: 90.43 MB (Mac) 78.29 MB (Win 32) 79.16 MB (Win 64)
Download iTunes 10.1.1.4 direct link from Apple.com

Release date: 2010-12-16
Size: 78 MB
[click to continue…]

The Application “ ” was not installed on the iPhone “ ” because an unknown error occurred (0xE8008001).
Are you keep getting this 0xE8008001 error everytime you tried syncing your iPhone with iTunes?
You just finish downloading new iPhone application(s) and tried to install it to your iPhone via iTunes. But, when you were syncing the new apps, all you got is 0xE8008001 error.
It happened because the apps is failed to pass DRM-check on iTunes. More information about this process is explained here: What is AppSync
How-to fix unknown error 0xE8008001 ?
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