successfully installed lineage-16.0-20190914-nightly-FP2-signed.zip 
but to avoid an unnecessary hassle in the future
-
could you upvote bug report
https://gitlab.com/LineageOS/issues/android/issues/937
The background is on Restore cloud backup asks for a 3x3 pattern, but is encrypted with 6x6 -
@chrmhoffmann and @z3ntu, could you provide some guidance on how to contribute to the build?
That could help to gain more supporters to lower the burden on @chrmhoffmann. If something forces you to cease work on it, the project is doomed.
There are guides on LineageOS.org:- My device is not officially supported, but I’d really like to give LineageOS a try. Can you support my device?
- Build for FP2
- https://wiki.lineageos.org/devices/FP2/build
but it does not explain how
- the device became a supported device,
- providing the device’s device specific configuration and kernel.
- integrate patched from FairphoneOS
- fix things like the reason for the latest outcry
p.s. I have a 10.1 2014 tablet, which is now unsupported. If understand better the background of building LOS, I want to give it try to make official again.