LineageOS 19.1 (prerelease)

Changelog:
- Initial public prerelease

Bugs:
- DT2W

Notes:
- Using retrofit dynamic partitions, no other recovery other than provided Lineage Recovery will work
- No custom kernel will boot, cry about it
- Report issues if you find any 

Installation instructions:
- Follow the instructions in the XDA thread
https://forum.xda-developers.com/t/rom-sv2-unofficial-retrofit-lineageos-19-1-for-mi-9-cepheus.4465175/