Zorin OS crypt removal/stuck

HI,

I installed Zorin OS (latest version) about a week or two ago and initially set it up with full-disk encryption. Me being an explorer, I've wanted to switch to Kali Linux or some other OS.Couple of problems.. the crypt prevents me from booting from USB or CD/DVD at all, and I cannot find a way to get rid of this. I got rid of the key.. and now I believe I can't boot/login to the OS at all. Is there a way to bypass this, or wipe the HDD entirely via some other method?

Please help.

I didn't find the right solution from the Internet.

References:
zoringroup.com/forum/viewtopic.php?f=5&t=12716
Creative infographic design agency

Thanks!