[Q] I think I hard brinked my phone topic

So when I try to boot up my phone, on the top left corner it says
"boot certification verify
-----------------------------------
Secure booting error!
cause: boot certification verify
-----------------------------------"

And when I try to access download mode it says
"fastboot mode started
--reset--
--portchange--
fastboot: processing commands"

and the phone is not recognized by adb devices in command prompt.

This all happened when I went from CM12 to CloudyG3 and tried to restore back to CM12 using TWRP.