68Clean bootWarning! You should only perform a clean boot when all otherreset options have failed to restore your smartphone to anoperational state.A clean boot will restore your smartphone to the factorysettings.Warning! This will erase all your personal information, any contactsstored on your phone and any programs you installed.Remove the battery and replace it after three seconds. Pressthe power button while pressing both the Talk/send and Endkeys. After the phone has vibrated twice, release all the keys.