I suggest you do as I do. Boot from Windows 7 PE. You make a bootable USB flash drive with Windows 7 PE (I still did it on Windows 8 PE, but not Windows 10, it doesn’t have a firmware program), copy it to a USB firmware and a firmware program (you may also need drivers for your network card). Boot from the flash drive and from the loaded Windows 7 PE do all the operationsNone of the tries to use the newer firmware solve the issue.
Now the problem is, I only have Mac computers, and the tutorial that I fond to downgrade firmware is a windows only... Tried even to instal a windows partition, but didn't worked well...
Any suggestions on how to downgrade using a MAC computer os a iPhone?
Thanks!!!