Device info https://wiki.lineageos.org/devices/v521
Rom https://www.androidfilehost.com/?w=files&flid=299927
Please Note: This is an Untested build. Please try at your own risk.
I made an update for this device, enjoy 
:
e-0.9-n-20200705-UNOFFICIAL-v521.zip
TWRP : TWRP-3.1.1-0_v521-recovery.img
Don’t forget to backup and share your experience, thanks 