There are two ways Casio update:
- Using recovery (to update installed OS)
- Using Fastboot (to recover Casio update)
If you want to install a Casio update using recovery – download the official update, reboot your phone or tablet into recovery mode and click “Install update from SD card”.
To install Casio update with Fastboot – download and install drivers and ADB&Fastboot, download official firmware and flash it by instruction.