[Magisk] simplepinoi177:
From a personal correspondence, but after permission opted to include it in this thread so that it might display to anyone not to hesitate and feel free/welcome to inquire here/to-me, might be helpful/supplemental here, and/or maybe even be clarified or made clearer by others...

It does not have to be a device you actually use. You can use Samsung, HTC, Acer, ASUS, Vivo, Xiaomi, etc.. Samsung looks good, but I wouldn't suggest the very popular Galaxy S series (as opposed to the considerably less popular burner-type or budget smartphones), as spoken about at the bottom of Section 2 (non popular or well known devices).

No worries about being "noob"...! I was one too! That's why i created that whole guide and thread -- to help those like us who was trying to get their head around all of it (i.e. "my head was spiraling!") and give a welcoming, safe-space for us all!

So I tried to word it so one might be able to figure out the search terms to use -- but I had purposefully be vague about it so it wouldn't catch on to non-members. But I personally had looked through a page of list of Android phones, and searched for 2017, then 2016, then 2018. But after I found my fingerprint and had stopped searching for myself, I did find a promising website that shows android phones on Oreo that I will probably use next time I need to search a new fingerprint.

But a.) looks pretty good, I would do 2017 personally. And b.) is how I personally got my fingerprint -- search, downloaded the firmware, and extracted from it; but many are finding it in those repositories -- my only misgivings on the repo's is that many of them aren't even smartphones and I feel the only reason why mine is lasting so long is that tricking Google with fingerprints on Android TV devices or Android radios or whatever is more suspicious than from an actual off-brand phone.

Yeah i saw that....but there's no need to worry about that particular module. Basically, Play Integrity NEXT does the same thing that Play Integrity Fix originally did (from version 14 and newer), but is able to update to a new fingerprint from a burned one without needing to literally update the module to a new version (no need to download the new updated version). PINext draws its fingerprint from the custom ROM that xiaomi.eu devs put in -- which is what PIF was doing from like 14.1 or 14.2. So, the seasoned experts are saying they are all jackholes "burning" through FPs because just on the practice on embedding fingerprints to a module that will be used by thousands upon thousands of people, thereby getting it burned within days (as it did in PIF), and as fingerprints are being burned 2 or 3 times a week and there is only a limited number of fingerprints that are viable of being used, it makes it just that much quicker to possibly burn all of them. But, there is a debate how likely that is -- it seems that Google is only temporarily banning fingerprints (so older PIF versions are starting to pass now for many users) or different ROM versions on all the different devices seem to all have potential, or some other statistical reasons (I can't recall exactly) so there may be more possibilities/options than worryers/concerned-ones would think.

But if you are willing to go find the fingerprint that PINext and/or the xiaomi.eu custom ROMs are employing to look at what OEM and/or device they are using as fingerprints to avoid -- there were some users/members who claimed that they were spoofing Asus and Acer brand fingerprints and they had theirs burned even though it wasn't what PIF/xiaomi.eu were specifically using and everyone supposed that it was because they were the same OEM and jokingly thought that they both were going alphabetically (Acer then Asus...). So that might be something to keep in mind, but there's no substantial evidence or proof of it in any case, so it might not mean anything staying away from the brands and if it ends up proving positive if you end up finding a fingerprint from the OEM anyways! And you might want to stay away from the exact fingerprint from the previous recent versions because they've been proven to be banned (hence PIF needing to be updated to a new version), but like I mentioned, old ones are starting to pass, so even then, in certain circumstances and given some time, it might be viable to use.

Sorry I can't guide you into how to find what they are using in either PINext or xiaomi.eu custom ROMs, but I'm sure if you search and/or ask in the PIF thread, one of the experts would give you the pertinent info.

UPDATE: was just reminded of THIS POST HERE, that should perform finding xiaomi.eu custom ROM's fp...

Of course! I'm here to help and love would love to...! I'm glad you found it very useful; that was my aim in it.

Just let me know how I can help!

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