When you try to update your Windows Phone 7 you might receive the following error messages. Microsoft has made available a free troubleshooting tool that’s designed to help customers who encounter these two specific update-related errors.
We couldn’t update your phone because your operating system might be corrupt.
The timer ran out on what we were trying to do.
If you encounter 800705B4 while trying to install the February update, first try deleting the history files for Internet Explorer Mobile, Maps, and Search.
If that doesn’t help, try using the Windows Phone Support Tool. Download, and install the Windows Phone Support Tool. Make sure you’ve unplugged the USB cable from the phone before you do the install.
- Start the Windows Phone Support Tool.
- On your phone, press and hold the Power button for 5 seconds until the message Goodbye! appears.
- Press the Power button again to turn the phone back on. As soon as the phone turns on and vibrates, press and hold the Camera button until the "Connect to PC" screen appears. It may take a few moments for this to appear. As soon as the screen appears, you may release the Camera button.
Reconnect your phone by using the USB cable.
In the Windows Phone Support Tool, click the Recover button.
The Windows Phone Support Tool will install an update that fixes the problem and restart your phone. If your phone is locked, enter your password when prompted.
When you see "The device has been updated" text, located at the bottom of the screen, close the Windows Phone Support Tool and disconnect your phone.
Reconnect your phone to the computer to install the latest phone update by using the Zune software.