Black screen with red and blue flashing LED topic

Hi I use a LG G3 and flashed a zip that was not designed for my phone (Validus-shamu-5.0.1.alpha.1.0-TEST-20141217-2151.zip) by a accident and rebooted, and now my phone has a black screen and the led is flashing red and blue (and said boot certification error prior to that stage). How can I fix it?

Additional info: I was using the latest TWRP recovery, and own a d852 variant.

Any input would be appreciated! This is my only phone and I would like to resolve this as soon as I can.