i have the BIOS of a X11SPL-F with 255W TDP support. beleave me, its not the BIOS.I asked a Chinese processor seller, what does he do with MB? he replied, that he was cleaning the bios))
I also asked to send me the firmware, but he pretends that he does not understand me)))
the VRM controller supports a 3 Pin PMBus interface to change Register values(ICC_MAX), you don't need to desolder anything.
another problem i see is about the weak VRM of the X11DPi & X11DAi. why don't you take a ASRock Rack board ?