I have a Full installation on a CF card to IDE adapter.
I've tried many builds including the new 4878.
Upgrade from CDROM will always fail with this output:
...
Installing system files on device ad0s1.
Restore system files on device ad0s1.
Restore system configuration
Restore configuration
Error:Failed to mount device 'ad0s1'!
Unmount CDROM
There was a problem while restoring configuration file.
Press Enter to continue.
Tried upgrade 0.69.2FULL to 0.7RC1 4735 FULL, both on my box and in virtual machine, it will always fail due to the failed to mount error.
Once I say the message is a little different, it said write failed ,file system full.
Even I give 256MB to 0.69.2FULL , upgrade to 0.7RC1 4735 still failed;
Upgrade 0.7RC1FULL 4735 to 0.7RC2 4878 failed too, with the same error message on the first floor.
So I believe upgrade FULL installation from CD is broken?
I have seen the same behavior and been unable to sucessfully update Full HD installations. See: Failed to mount device error while upgrading Full install
https://sourceforge.net/apps/phpbb/freenas/viewtopic.php?f=92&t=3629&p=18769#p18769
It was fixed. (4975)