Dell Precision M6800 & QUADRO P4000 (VBIOS update)

Hello.

I have a Dell Precision M6800, and recently I got a NVIDIA Quadro P4000 (ID:10DE:1BB7:1028:07B1).
The Dell BIOS did not identify it, and it's only working if
I'm Linux user, and it works if ACPI and dynamic switchable graphics (Optimus) are disabled.

The graphic is: NVIDIA Quadro P4000
Version: 86.04.3A.00.3A
ID: 10DE:1BB7:1028:07B1

I want to enable ACPI and discrete graphic.
I saw several users had the same problem with a Quadro P5000, and it is easy to fix after updating the VGA BIOS (86.04.2E.00.0D), but I did not find a new similar VBIOS for my P4000.
Can you please provide a path/url where to find it?

Thanks.
Juan Pablo