cant change password for RHEL 8.5 KVM

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I have downloaded the RHEL 8.5 KVM inside GNS3. Wanted to change the root password.
I am following this [https://access.redhat.com/discussions/664843#comment-now] article.
><fs> mount /dev/sda1 /
is not working. It says
libguestfs: error: mount: mount exited with status 32: mount: unknown filesystem type 'xfs'

Help will be highly appreciated.

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