How can I tell if my Mini Famicom is hacked or not?

[/classicNES]

I hacked my system in like 2019 or so, I don't remember if this was before or after Hakchi started putting the stock kernel in an unused part of nand or not.
I just went into the desktop app and clicked Uninstall Kernel, and it said it was successful, and there's no splash screen anymore when I boot, all the original games are back... but my savestates and settings were left unchanged. So how do I know if it actually reverted back to stock or not?
Also, I downloaded a stock kernel from someone else, but I don't know what the file should be named or what folder to put it in, or how to use it in the Hakchi app.

submitted by /u/OlimarJones
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