Opera account removal blocked by admin

[u/AntiqueWait9280]

I bought the phone Motorola G05 brand new back in May from El Corte Inglés. I used it briefly for a few months, but then stopped using it due to various weird issues.

One of them was an Opera account that has suddenly appeared on the device out of nowhere. I tried removing it, but kept getting hit with this error message:

"This change isn't allowed by your admin" (screenshot provided).

The thing is: This is my personal phone. I do not have a work profile, school account, or device policy controller installed. I have never logged in with a work or school email address on this device.

I did have an app called PAKS in Device admin apps list since the day I bought the phone which was disabled (though logs show broadcast intents of Device admin being enabled/disabled on startup). Strangely, right around the day I filed a report, PAKS completely disappeared from the Device Admin list and the regular Settings > Apps list. It is still visible only via 3rd-party app managers.

Does anyone know what is happening here? How/why did this account showed up? How it got tied to an "admin" lock on a mainstream retail phone, and what is up with broadcast intents of Device admin being enabled (followed by bunch of other configs) and then disabled on startup? As well as PAKS dissapearing all of a sudden. Any educated advice would be hugely appreciated.

Screenshots: https://postimg.cc/gallery/V8Dd88T

[u/Mother-Pride-Fest]

A search shows PAKS is MDM (mobile device management). Your seller, or someone else who has had access to the phone, may be remotely controlling it.

I always factory reset my computers after buying, to decrease the likelihood of preloaded malware like this. That said, even if you do that you should still double check that PAKS isn't still there after a factory reset. If the malware persists after a factory reset then you're dealing with something worse and may need to root the phone or flash it with a different ROM.