I attempted this but I got a message about the UEFI not compatible with MBR on the HDD. The only alternative is to temporarily reinstall Win 7 on a HDD to complete the downgrade. My question, is there anywhere I can get a DOS based firmware 2.99 that is not OS 7 or 8 based to complete the downgrade of the firmware on my machine? The firmware from HP is only OS specific. The reason I say that is that, the SSD I have been trying to use, and I have tried two different SSD's, 1) Samsung 850 EVO 500GB 2) Crucial BX300 120GB, and neither one shows up in UEFI BOOT choices. I am still having problems with SSD showing up in the list of UEFI boot devices.
With a lot of help from a friend, I got my hands on a USB thumb drive that was created based upon your video. I think my mistake was upgrading the firmware to 3.0.4, I believe I need to downgrade the firmware, from 3.0.4 to 2.99. Prior to watching the most recent in depth video posted on YT, I tried to cobble together a list of steps to transform my HP Compaq Elite 8300 CMT to a Hackintosh. Building a CustoMac Hackintosh: Buyer's Guide
