Yes, you just dd the image for the APU2 and then upgrade/downgrade the BIOS.
When I tried it, it didn't correctly mount the FAT partition, but it was located under /media/SYSLINUX - so if you need to change the ROM this is where you would look for the files.

What problem did you have with the mSata drive?



On Friday, April 22, 2016, Dave Taht <dave.taht@gmail.com> wrote:
ok, I stuck the latest rom on the boot stick, successfully updated the flash,

Impressive - there's 1 day old ubuntu 16.04 support for it... I had a
bit of trouble partitioning the msata card
and ended up installing it on a sdcard (am watching it do a netinstall
from the main site *overipv6!* which is a bit slow), will try harder
to get the install more local (not sure how)






On Fri, Apr 22, 2016 at 6:39 PM, Dave Taht <dave.taht@gmail.com> wrote:
> dd-ing the image to a usb stick booted the board. Yea!
>
> It also looks like there is some reasonable, if not complete, openwrt
> support for it...
>
> https://wiki.openwrt.org/toh/pcengines/apu
>
> off to upgrade the bios next.



--
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org