MP 1,1-5,1 Installing Windows 10 in Legacy/BIOS mode in cMP with Boot Camp Assistant

[Sergey-Galan]

Hey there! I found out this forum thread due to looking for a solution to dual boot Windows 7 with MacOS 10.13.6 with OCLP 2.4.0 (open core) on my iMac 11.3 with patched vBIOS at AMD Fire pro M6100 GPU (stated in my signature).
I tried to install Win7 by the different ways using the OCLP recomendation and other methods, but everything hung on the bootloader splash screen "starting Windows". My last attempt was yesterday using the "windows install" app discussed here, after copying the win7.iso by legasy install - nothing to do... only after UEFI installation the computer recognized the WinOS installed on a separate HDD, but I still couldn't boot Win7, much less launch Boot camp to install the necessary apple drivers.
At the moment, I can't provide a log file, since I can't launch either WinOS or MacOS yet! Due to the black screen and periodic reboot... (various manipulations with the "option" key, ESC, command+R when starting the iMac don't affect the appearance of the OC EFI boot-screen or booting into recovery mode). In this way - will have to remove the SATA HDD to restore the functionality of at least MacOS at second SSD.
Please advise solutions for starting Win7 or other options for dual installation on different iMac drives with patched GPU like M6100?

Hello. The program does not affect macOS and OCLP when installing Windows, check, maybe you have problems with the disk. Try installing again with legacy boot, while OCLP must be excluded, and the disk on which you install must be an internal SATA (not USB). And I would like to see the log, I will be able to see whether the program installs Windows correctly.

 

[Vladistone]

Hello. The program does not affect macOS and OCLP when installing Windows, check, maybe you have problems with the disk. Try installing again with legacy boot, while OCLP must be excluded, and the disk on which you install must be an internal SATA (not USB). And I would like to see the log, I will be able to see whether the program installs Windows correctly.

@Sergey-Galan, Thanks for the answer!
yes, I will check the HDD for problems...
as I wrote above:
Windows legacy installation - not visible for OC-boot; so I immediately changed the installation option to UEFI, but apparently due to the lack of additional drivers - Win startup shows an abnormal termination and I tried to fix it with the help of the win-processor, but after winondows hung on this page and I could no longer load either winOS or MacOS (they are on different disks)
UPD: installer log file was made after Win-HDD SATA switch off