Welcome to WA...try this: Nokia 9300 (not confirmed) and Nokia 9500 (based on link below): 1. Turn off phone and take out battery 2. Insert battery, and while it boots up press and hold Ctrl + Shift + F 3. After a few seconds you will be asked if you want to format or cancel http://www.howardforums.com/showthread.php?s=&threadid=580322