I haven't used it personally but I was told that the RockPi (https://rockpi.org/ https://rockpi.org/) is similar to the rpi but runs on totally free drivers. Ha

I haven't used it personally but I was told that the RockPi (https://rockpi.org/ https://rockpi.org/) is similar to the rpi but runs on totally free drivers. Having a backdoor with full system access is just not acceptable in 2019.