Although this software is made correctly,
the production side don't take the responsibility of any problems which arose using this software.
The specifications may be changed by the production side.
It dosn't guaranteed about specificity of 'Old low spec model',
'Singular specification model', 'Singular OS (MIUI,etc)', 'Custom ROM modified model'.
This app doesn't collect any personal data.
This app doesn't have network permission(feature), so data communication is not possible.
The source code made from this software can be exhibited and announced freely by self-responsibility.
The act which gives a disadvantage to public or individual is forbidden.
This application, prohibit these - A usage against GooglePlay-Terms,
and illegal act of copyright - Unauthorized duplication, Reverse-engineering,
Unauthorized distribution, and Diversion of this app-body source code.
The production side reserve the right to change 'Terms of use' along with changes in circumstances.
Please use after understanding and agreeing with this Terms.

Etc.
The manual of app can be printed and used freely as use of teaching materials.

NS-ware
Basic for Android -F