Trying to Reinstall FreeNAS 11 After Failed Upgrade

Yesterday, I tried to upgrade my FreeNAS 9.10.2 system to FreeNAS 11. The upgrade failed to set the boot environment to FreeNAS 11, so I did that manually after seeing a reboot simply took me back to FreeNAS 9.10.2. That was a mistake: now it boots into what appears to be FreeNAS 11, but when I try to go to the web GUI, I simply get "Internal Server Error." I am able to SSH into the server, at which point I tried to trigger another upgrade by typing sudo freenas-update -v update. When I try this, here is what I get back:

[freenasOS.Configuration:692] TryGetNetworkFile(['http://update-master.ixsystems.com/FreeNAS/FreeNAS-9.10-STABLE/LATEST'])
[freenasOS.Configuration:822] TryGetNetworkFile(['http://update-master.ixsystems.com/FreeNAS/FreeNAS-9.10-STABLE/LATEST']):  Read 2360 bytes total
[freenasOS.Configuration:692] TryGetNetworkFile(['http://update-master.ixsystems.com/updates/ix_crl.pem'])
[freenasOS.Configuration:84] CheckFreeSpace(path=/tmp/tmpa9lojvfr.pem, pool=None, required=1028)
[freenasOS.Configuration:822] TryGetNetworkFile(['http://update-master.ixsystems.com/updates/ix_crl.pem']):  Read 1028 bytes total
[freenasOS.Update:977] Going to try checking cached manifest /var/db/system/update/MANIFEST
[freenasOS.Update:1001] Got this exception: [Errno 2] No such file or directory: '/var/db/system/update/MANIFEST'
[freenasOS.Configuration:692] TryGetNetworkFile(['http://update.ixsystems.com/FreeNAS/Validators/ValidateUpdate-dAn5lU.txt', 'http://update-master.ixsystems.com/FreeNAS/Validators/ValidateUpdate-dAn5lU.txt'])
[freenasOS.Configuration:84] CheckFreeSpace(path=/var/db/system/update/ValidateUpdate, pool=None, required=187)
[freenasOS.Configuration:822] TryGetNetworkFile(['http://update.ixsystems.com/FreeNAS/Validators/ValidateUpdate-dAn5lU.txt', 'http://update-master.ixsystems.com/FreeNAS/Validators/ValidateUpdate-dAn5lU.txt']):  Read 187 bytes total
[freenasOS.Update:1034] DownloadUpdate:  No update available
No updates available

Is there any way to force (from the command line) for the system to go through the FreeNAS 11 install process again so that it fill in whatever clearly didn't install properly in the previous version? If I can do it by SSH that would be idea -- the system is headless, so if I can take advantage of that SSH connection to repair the damage without starting from scratch, that'd be very helpful.

(I tried editing /boot/grub/grub.cfg to set default to the previous, FreeNAS 9.x entry so that the system would boot to the previous version, but that didn't seem to have an effect when I rebooted. Of course, that still wouldn't solve the improper FreeNAS 11 install anyway.)