L-B It won't lift the signing restriction, but it will pave the way for enabling permissions, sideloading our "fake-signed" apps from the regular File Manager, and changing defaults without ADB trickery needed.
This is a regular Android settings application, pulled from another cheap LG prepaid Android smartphone.
It happens to be "compatible" with the LG Classic Flip if you follow my steps.
If your "Files" app is stopping a lot, back up and factory reset. I was not able to recreate any issues mg5077 as long as I factory reset before attempting this.