Secure boot error after reverting to KitKat via TWRP backup topic


Hey everybody! Please, I need urgent help!
So, yesterday, I upgraded my G2 from rooted stock KitKat to the official European Lollipop, v30b. Before that, I made a TWRP backup of everything.
So, I rooted Lollipop, installed TWRP, and was about to install the new Xposed for Lollipop. Then, **** started freaking out and "LGSmartCover" kept crashing continuously, making it virtually impossible to navigate the UI.
Soooooo, I decided to revert back to KitKat via the TWRP backup.

Everything SEEMED fine, but now I cannot boot. I get the LG logo, then this message appears:

Quote:









ERROR : boot certification verify
[800]_______________________
[850]
[900] Secure booting Error!
[950] Cause : boot certification verify
[1010]
[1060]_________________________




I do not seem to be able to enter download mode or recovery either.
What do? I'll be eternally grateful if somebody can help me solve this.

my secure boot error




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