9-2 Caring and MaintenanceRestoring Factory Default StateIn some cases, you may need to restore your device to the factory defaultstate by clearing the memory from your device. For example, you shouldclear the memory:z When your device does not respond after being restarted.z When you forget your password.Clearing the memory means all data you have entered in your device’smemory, including all files, system settings and additional applications youhave installed, will be erased. (Applications installed to ROM at the factoryare not affected.)Follow this procedure to clear the memory from your device:1. Remove the battery and then replace it.2. Press the Home key and Enter key, and while keeping the twokeys down, press the power button.3. Release all the keys when you see the “Clean boot” message.