Root LG D321 BOOT CERTIFICATION VERIFY HELP

[DEATHEXE]

I HAVE AN LG D321 FROM CRICKET WITH RECENTLY GOT THIS ERROR
STARTS LG SCREEN WITH
ERROR: BOOT CERTIFICATION VERIFY
SECURE BOOTING ERROR!
CAUSE BOOT CERTIFICATION VERIFY
THEN GOES INTO BLACK SCREEN
CANNOT GO INTO DOWNLOAD MODE
WHEN I TRY TO FACTORY RESET PHONE AFTER I CONFIRM RESTORE TO DEFAULT
PHONE TURNS BLACK AND NOTHING HAPPENS
PLEASE HELP
DID NOT ROOT OR ANYTHING PHONE THIS JUST HAPPENED PROBABLY AFTER AN UPDATE

WHEN I CONNECT TO COMPUTER
PHONE IS DETECTED HAS 2 FOLDERS IMAGE AND VERINFO FOLDER ONLY

 

[Taumic]

Unlock bootloader and flash proper aboot