https://forum.xda-developers.com/lg-g-pad-83/help/v521-bootloop-upgrading-to-twrp-3-1-1-0-t3655105
v521 Bootloop after upgrading to TWRP 3.1.1-0, flashing latest Lineage
Reply
https://forum.xda-developers.com/lg-g-pad-83/help/v521-bootloop-upgrading-to-twrp-3-1-1-0-t3655105
https://forum.xda-developers.com/g-pad-x-80/how-to/nougat-7-0-v521-guide-to-update-v521-lg-t3533338