The only way to install a custom recovery on the e980 is by installing FreeGee, our boot loader is locked and the only way to bypass that is by installing FreeGee after you are rooted. You need to return back to stock using LG flashtools and start over again, once you are done with the restore, then you root and finally FreeGee, and you should be able to flash anything you like.
Hope it helps.
At&t LG Optimus G Pro, Commotio 4.4.2 thanks to DHO @team Vanir
Nexus 10 32gb, running ThunderKat 4.4.2 thanks to @craigacgomez.