Casio A-21 Hard Reset

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 A-21


You should reset the A-21 whenever you suspect some external oddity as caused it to malfunction. 

To reset the CASSIOPEIA A-21

  • Press the Reset button with the stylus.This automatically turns off CASSIOPEIA power.
  • Press the power switch to turn on power and start the reset process. 

Full Reset

Perform the full reset when you want to clear all memory contents and settings because memory contents are corrupted, because you have forgotten the security code, or for any other reason. 

Note: The following procedure deletes all data in memory. make sure create back up of your important data. 

To perform a Casio A-21 full reset 

  • While holding down the Ctrl key and the Alt key, press the Reset button
  • The message "All memory contents will be deleted! Touch the screen to continue..." appears on the display. 

If you don't want to perform a full reset, press the Reset button. This performs the normal reset, which does not clear memory contents.