How to reset password of Host FBSD OS.

Hi,
We have system with 9.2 FreeBSD OS, unable to login coz because of a lack of credentials. Also note that I can't mount root partition as modifying anything there may not reboot to OS because of signing feature. I could get some information about system which I was interested to know, by creating bootable USB with FreeBSD OS and booting to USB.
But how do I reset Host FreeBSD OS password/credentials without mounting root / partition??

Thanks in advance for any following responses.
 
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