User Manual Innioasis G1 MP3 Player with Bluetooth and WiFi, 4" Full Touch Screen MP4 MP3 Player

To set up parental controls, go to Settings >> System >> Reset locked and set a password.

That way, the reset option will be locked and your kids won't be able to use it to install new app or restore apps you uninstalled.

https://manualsfile.com/product/k3dwa3sblk9.html?page=64#readOnline

To reset factory, go to Settings >> System >> Reset to factory settings.

https://manualsfile.com/product/k3dwa3sblk9.html?page=59

Although the G1 player turns off side-loading of apps .
To install new app, You can install via apk file.

Please read "How to update pre-installed apps" to install:
https://manualsfile.com/download/k3dwa3sblk9/0.html