Recovery of zpools went corrupt!?

[Zenny]

Reposting the mail below as I had an oversight not to include subject
line. Apology in advance!

> Hi:
>
> Last time, Devin had been very kind to suggest me when the system
> borked while trying to upgrade from v10B3 to vRC1.
>
> Following FreeBSD 10.0-RELEASE, I installed to a new machine with
> encrypted root in zfs mirror, and since there was something wrong (a
> double quote by mistake) inserted in the /boot/device.hints, the
> kernel refused to boot and landed to the mountroot prompt.
>
> Therefore, in order to make changes what I did was:
>
> 1. Boot into LiveCD mode
> 2.     mkdir /tmp/bootpool
>         zpool import -f bootpool
>         zfs set mountpoint=/tmp/bootpool bootpool
>         zfs mount -a
>         cp /tmp/bootpool/boot/encryption.key /tmp/
>         zfs umount -a
>         zfs set mountpoint=/bootpool bootpool
>         zpool export bootpool
>         geli attach -k /tmp/encryption.key /dev/ada0p4
>         geli attach -k /tmp/encryption.key /dev/ada1p4
>         zpool import -R /mnt zroot
>         zpool import -R /mnt/bootpool bootpool
> 3. Removed the double quote (") from /bootpool/boot/device.hints and
> saved the file.
>
> 4. Rebooted the file and now it says that there is no boot/zfsbootloader.
>
> Appreciate if someone provides hints to recover the system in such
> situation without loosing any customized kernel and poudriere configs
> and contents? Thanks.
>
> /z
>