RX 480m on Dell Precision M6800

Hi! I have a RX 480m MXM and I want to make it work whit Precision M6800. I have found a vbios who work perfectly in Windows 11, Ubuntu 24.04 and MacOS, but just with AMD Hybrid enable and main display (laptop lcd) driven by IGPU. External displays are working OK trough RX 480m (4 external displays). I want to use it without AMD Hybrid (IGPU), to have GPU hardware acceleration on MacOS. Without AMD Hybrid enabled I can boot whit legacy enabled (doesn’t help me much because I need UEFI for already installed Windows and for MacOS), but black screen with pure UEFI. Does anybody knows how to modify the vbios to make UEFI booting OK on this workstation?