Special security features? Fairphone either doesn’t or improperly supports basic security features. They’re late on security patches, their implementation of verified boot is broken, and generally their security is worse than any other major phone brand.
All of it, custom roms dont help at all. For example custom roms dont solve their broken implementation of verified boot or how they used public keys for verified boot. In addition custom roms rarely go out of their way to add security patches that the OEM hasnt added themselves. For example, GraphineOS relies on Google to publish security patches in a timely manner for them to keep GraphineOS secure. GraphineOS can trust Google because they have a proven track record of publishing open source security peatches in a timely manner while Fairphone has proven to be the exact opposite.
Special security features? Fairphone either doesn’t or improperly supports basic security features. They’re late on security patches, their implementation of verified boot is broken, and generally their security is worse than any other major phone brand.
How much of that is relevant with a custom ROM?
All of it, custom roms dont help at all. For example custom roms dont solve their broken implementation of verified boot or how they used public keys for verified boot. In addition custom roms rarely go out of their way to add security patches that the OEM hasnt added themselves. For example, GraphineOS relies on Google to publish security patches in a timely manner for them to keep GraphineOS secure. GraphineOS can trust Google because they have a proven track record of publishing open source security peatches in a timely manner while Fairphone has proven to be the exact opposite.