Before you give your handset to repair shop or buy new handset, please try the following procedure to repair your device. First charge your battery more then 70%, backup your important data like phone-book, message, email, images and settings and in most cases take out SIM card and SD card. After doing hard reset not possible to recover your data, so online backup is always important. For all of your data, a backup should be done on a external device, hard drive, raid system media or SD card.
How to Hard Reset Casio IT-10 M20
You should reset the IT-10 M20 whenever you suspect some external oddity as caused it to malfunction.
Reset switch This switch resets the terminal, like to turning off and on the power switch. Reset the terminal when some oddity occurs, such as if the buttons or tap operations stop working.