Sonim XP3800 General Question and Help

I once made a logcat while i was trying to install a regular app and while i was trying to install a system app. I didnt understand almost anything but there were tons of errors. Not just 1. I wonder though, there must be some way the phone Differentiates between a system and a non system app. If there’s a way we can figure out what that is then we can solve the problem by doing that in our apps

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Its called signatures.

It only installs apps signed by Sonim.

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I thought u said that u already tried the zello signature

I tried using Lucky Patcher to sign an app in a way that might trick the package installer into thinking that it had Sonims signature, but it didn’t work.
The only way to actually sign it with Sonims signature is if you have their signing key.

Why doesnt musicolet work? (It crashes when it gets to updating queue and then crashes every time right after opening) or is there any version of it that does work?