Alienware Area 51 R5 - how to disable ePSA?

I’m using an Alienware Area 51 R5 motherboard (LGA 2066) - MS-7A87 VER 1.0 outside Alienware case and I’m stuck with some kind of trouble.
When I power on my system it starts with Dell SupportAssist Enhanced Pre-Boot System Assessment (ePSA), unless I push Esc right after powering on, then ePSA skips and system is loading.
ePSA is checking connected fans, and hangs when it can’t detect one (actually I’ve managed to connect all suitable fans except U.2 FAN 1, which is connected to separate board, which I don’t have).
Is it possible to somehow remove ePSA from the BIOS module or do something else to skip ePSA on start?