If you are one of the many that did an upgrade to Windows Phone 7 without the official download, you might already has a “Walshed” phone. That means you are not able to get other updates from Microsoft when they are released to your telcos. It will return an error when you try to update.

However, thanks to Chris Walsh, he has made a tool that will repair your Windows Phone 7 devices and re-enabling official update compatibility.

Click Here to Read all about it (or download the tool kit)

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(source)