How's can iOS 14 Public Beta Program profile install on my old iPhone?

App & System Services Core OS iOS iPhone Beta Feedback Assistant

pverro OP

Created Nov ’20

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I sold my iPhone X to my girlfriend, and I'm surprising that iOS 14.3 is installed in her iPhone without any profile in settings.
Is it possible that I haven't unregistered the iPhone before initialise ?
Also, the feedback assistant app is install in the apps. I can't remove it.

Her last backup in her old iPhone 6 was iOS 12.4.9.
How do I install the official iOS 14.2 version if I can't remove the profile ?

Best regards

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