[blue68f100]

The GOS units do not upgrade like the SnapOS units. With the GOS units you will loose all of your data. You will break the raid when you install the new HD for the GOS transfer. Then power down and move the second HD to position 1. Boot the unit. From here I would follow Andy's guide and use the "touch /nopivot" cmd to force the unit into the Recovery console. From there you can do a Clean Install. Just select the v5 gsu and use the Clean Install Option. Once done you can Install the 2nd HD and do the initial setup. Andy does reboots and HW reset between steps. According to Andy and the Log the GSU includes BIOS updates, this is needed for 2T HD. V4 has support only up to 1T HD's.