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Ifixit gives fairphone 5 a 10/10 on repairability and maintanence
(www.ifixit.com)
This is a most excellent place for technology news and articles.
Ye, latest rom i found back then was a lineageos rom that was android 11, june 2022 release iirc ( or 2021? ). It was awesome and worked great. Alas, after 8 years it is now my spare phone incase of issues :)