http://j26dlfmtgrt5ntjzzh5pbj2ytkginjkrtseqceyn37lu3yb4hm6hd7qd.onion/detail/divestos-mobile
It has many goals, but primarily: prolonging the life-span of discontinued devices, enhancing user privacy, and providing a modest increase of security where/when possible. The devices DivestOS supports are not fully free (as-in-freedom) and there are many security issues we cannot solve such as insecure proprietary blobs, insecure firmware, insecure bootloaders, and insecure ancient kernels.