Upgrade from 8.2 to 8.3 with freebsd-update. ROOT MOUNT ERROR

I would like to update a FreeBSD 8.2-RELEASE server to the 8.3-RELEASE. I have done a copy of the server disk on another one and I tried to update the copy, so the server is still working.

On the test machine, after the commands:
Code:
# freebsd-update upgrade -r 8.3-RELEASE
# freebsd-update install

the system doesn’t boot anymore, with the error:
Code:
ROOT MOUNT ERROR

Typing the ? command it prints:
Code:
mountroot> ?

List of GEOM managed disk devices:
 acd0 gpt/10GB ad0p2 ad0p1 ad0
Loader variables:
vfs.root.mountfrom=zfs:poolusb/zfsguru-system-8.2-002
vfs.root.mountfrom.options=rw,noatime

Booting the system with mfsBSD I can import and export the pool.

What can I do?
Thanks.
 
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