Casio IT-G400 Series - OS Updating Service for Application; How It Works

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11.2.2 OS Updating service for application
Below are the tools used for OS update from application.
(1) OS Updating service
It is a program that is called from application in order to update OS.
File name : OSUpdateServiceXXXXXXXXXX.apk
Note! XXXXXXXXXX stands for version. However, in the following explanation, it is
described as OSUpdateService.
(2) OS Image file used for updating
OS image file used for updating. The update service above uses it.
File name : 81.52_XXXXXXXX.PFU
(3) Sample application
This is the source code sample of the application calling the above update service.
File name : OSUpdateSample.zip
11.2.3 How it works
The following explanation assumes that OSUpdateService is installed in advance.
(1) Application downloads the "OS update image" from your file server to the
"/storage/emulated/0" of IT-G400.
(2) Application issues "START” intent together with the PATH to the "OS update image".
(3) The OSUpdateService invoked by the intent above will check the integrity of the
specified "update image file", restart the terminal, and update its the OS.
(4) The application receives the "COMPLETED" intent issued by the OSUpdateService and
checks the result.