On 13th Gen:
This also assumes you’re NOT dual-booting with Windows.
-
Boot to splash screen for Framework, tapping F2 rapidly.
-
Arrow key to Administer Secure Boot, press enter.
-
If Secure Boot Status is Enabled in the list, Arrow down to Enforce Secure Boot, enter key, choose Disabled, enter key.
-
Still on this screen, arrow down to Erase all Secure Boot Settings. Enter key, choose Enabled, enter key.
-
Press F10.
It’s now disabled.