I did two upgrades on my toys.
One is ASUS O!Play 1.29N.
Upgrade is just download new firmware, decompress it and put it into USB disk. Plug it in the OPlay and navigate to the setup, firmware, upgrade. One minute, Done.
The other one is D-link DNS323 v1.09.
It is more simple. Download firmware form official site, Decompress and login the admin panel of DNS323. Upgrade through menu.