I picked up some cheap P400 controllers for some experimenting in the Home Lab. They had really old firmware ~v4.x. I was having difficulty entering the ROM-based ACU, so I figured they needed a firmware update.
Long story short... you can upgrade the firmware on these things even in non-HP hardware. Download the HP Smart Update Manager from HP's website here. Burn the DVD (trust me, I spent 30 minutes trying to get it USB bootable), use the auto-update option, and off you go! Controller updated.
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