Upgrading stable installation on a encrypted disk

[lea0342]

I installed OpenBSD 6.1 in an virtualbox VM, using the FAQ to install to a full disk encryption softraid.

My current disks in the 6.1 installation is:
# sysctl hw.disknames
hw.disknames=wd0:34352553674n45n56,cd0:,sd0:93c4e4 6739bc0586

My current layout in 6.1 is this:
/dev/sd0a - /
/dev/sd0k - /home
/dev/sd0d - /tmp
/dev/sd0f - /usr
/dev/sd0g - /usr/X11R6
/dev/sd0h - /usr/local
/dev/sd0j - /usr/obj
/dev/sd0i - /usr/src
/dev/sd0e - /var

Now that 6.2 is released, I wanted to upgrade but when I tried the "Upgrade" option in the 6.2 release, i get the following disks in my system:

# sysctl hw.disknames
hw.disknames=wd0:34352553674n45n56,cd0:,rd0:3n4nm6 7365298m

I think i need to decrypt and mount the disk so that the installer found the "sd0" softraid disk, but i couldn't find a way to do that.

What are the steps to upgrade a system installed to a full disk encryption softraid disk? thanks in advance!