flashed … custom software

Any hints on where one might find details on this?

Included warranties are typically very short and extended warranties are worthless.

I haven’t really dug into this, but AirGuards github page claims the app scans periodically and will give you a notification on suspicious results.

Aha. It appears Google’s release of android has that sort of functionality baked in. I wasn’t aware of that.

Still, it seems out of scope for an operating system.

It looks like the EFF recommends some app called “AirGuard”- even over using the built in scanners.

With a term that broad- how is anyone supposed to answer you?

In an app? On a website? Something you suspect the hardware might be doing?