32 GB SanDisk Ultra hangs net5501

Hi,

I bought a SanDisk Ultra 32GB, in order to upgrade the disk in my net5501,
however, with the new CF card plugged in, the box doesn't boot it stops here:

comBIOS ver. 1.33  20070103  Copyright (C) 2000-2007 Soekris Engineering.

net5501

0512 Mbyte Memory                        CPU Geode LX 500 Mhz 

Pri Mas  SanDisk SDCFHSNJC-032G

And then just hangs, I waited a couple of minutes before power cycled the
box. I tried with all three comBIOS version available from the downloads site [1]
More googling, I found some related issues with solutions on that page here [2]
However, also setting the flash=secondary
only changed the last line starting with "Pri Mas" to "Pri Sla"
but it still did hang.

I tried this CF card on my desktop, and I was able to access it without issue.

Other than having the COM speed set to 9600, no other changes to the settings
of the box.

Any other ideas I could approach, besides trying different CF cards from
other vendors?

cheers,
Sebastian

[1] http://soekris.com/downloads.html
[2] http://soekris.com/Issue0006/