Just a quick guide from my installation of DSM 6.2.1 Update4, before I forget it. The process was much easier than I expected, thanks to all the contributions and sharing in this forum.
*** This guide required MODDED BIOS and a HP NC360T NIC ***
Hardware Setup
Flash kamzata's modded bios, use attached file to burn an USB drive with the modded bios, boot the server from it and let it completes the bios flashing
Install the HP NC360T NIC, I bought a used one in Taobao for 14 bucks
Load "Optimal Defaults" from BIOS, then
In Advance page,