That's helped me! Thank you! Finally I've got Resizable BAR feature is on. Nvidia site confused me, it says that for MSI I should use MSI Dragon Center OR MSI Live Update to update VBIOS. I've chosen Live Update because of smaller size.I believe you must use dragon center to update vbios. Liveupdate won't do it.
Yep read you need to be UEFI firs convert Windows then set BIOS to UEFIGo to Dragon center -> Live update -> Advanced.
I updated the Vbios to 94.4.3A.40.65. But after all if I enable the resiazble bar in the BIOS than the MOBO (MSI MPG Z390 Gaming Pro Carbon (MS-7B17)) don't post.
I should do a CMOS clear and start without it.