Forgot password for Firewall & FireVault
I honestly don't remember setting a password for my Firewall nor my FireVault. Is there any way to reset it?
iMac (2017 – 2020)
Gulp!
If you forgot your firmware password
If you can't remember your firmware password, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.
https://www.digitaltrends.com/computing/how-to-reset-your-login-password-on-a-mac/