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PSA: always update your smartphone | Ratel RAT targets outdated Android phones in ransomware attacks
(www.bleepingcomputer.com)
A community for Lemmy users interested in privacy
Rules:
I haven't done it in ages as I have a Pixel, but the norm used to be go to XDA Developers. Everything you need should be there. Guides, reputable links, etc.
Nowadays people use the popular ROMs like Lineage (you might remember as cyanogenmod), or GraphineOS. There are a few others, too. But XDA is always a good resource.