If you experience problems with SYNC®, you can perform a master reset. This process erases all stored data, such as call history, text message information, and previously paired phones, and restores your system to factory settings.27
There are a few things you should do before starting step 1:
Press the PHONE hard button.
Select the ‘Settings’ tab on the touchscreen.
Scroll using the seek buttons on the touchscreen and select ‘Master Reset’.
SYNC will ask you to confirm. Press 'YES' to continue.
SYNC will confirm when the master reset is complete.