I made an update for this device, enjoy :
(Yes it’s on nougat because it’s the last version officially supported by LineageOS for this device, so now we are almost sure to have at least one version working very well.)
TWRP : https://dl.twrp.me/hammerhead/
Note : this is a custom build and not an unofficial build because the system partition is too small to have all the system apps in it.
LibreOffice Viewer has been removed. Hopefully, you can easily download this app thanks to the built-in /e/ Apps Installer. Search for “LibreOffice Viewer” and install it. The only difference is that it will be a user app instead of a system app and that the icon will be visible on the homescreen instead of being hidden.
Don’t forget to backup and share your experience, thanks