LG D325 - boot error, boot certification verify, DBI Err fatal

Device: LG-D325

I tried rooting, unlocking bootloader, and installing custom rom ().

I successfully gained root & unlocked bootloader. Than it all went down.
I flashed recovery and booted into it, using "fastboot boot recovery.img" command.
I flashed cm12.1 and after that I got the "purple screen" error.

When phone is off and I try to normally turn it on:
1st screen:

Secure booting error! Cause: boot certification verify

2nd screen:

DemiGod Crash Handler : DBI Err Fatal! Board Rev.: 1.0 Ram dump mode. Option : SD card ram dump mode. Push below files to sd card before test. rdcookie.txt, rtcookie.txt Please do following action. 1) Ram dump Mode. Please connect USB. 2) Get the ram dump image using QPST Configuration. 3) If sdcard ram dump enabled just wait for reboot. 4) Collect ramdump files from your pc or sdcard. 5) Send e-mail to

The same happens when I plug in the USB cable when phone shut off.

Also, I cannot enter the fastboot menu (previously I could - before flashing CM12.1 via recovery) using volume UP + power buttons. Therefore, I cannot enter recovery.

Any info on this situation?

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