Please Note: This is an Untested build. Please try at your own risk.
I made an update for this device, enjoy :
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.
Magic Earth, Pdf Viewer Plus and LibreOffice Viewer have been removed. Hopefully, you can easily download those apps thanks to the built-in /e/ Apps Installer. Search them and install them. The only difference is that they will be user apps instead of system apps.
Don’t forget to backup and share your experience, thanks