No their Efiflash.exe has option to update just microcodes to bios. Just enter efiflash.exe it should tell you commands. Adding microcodes is a nice feature.
I also have been wondering why Broadwell-EP’s won’t start.
Also MMtool is useless, As you need signed bios to flash it and MMTool won’t make signed files.AmiBcp makes broken files also I would avoid those.
Use UefiTool newest one and 0.22 for files and UEFI Editor if you want to research or modify bios values.
But first You have get around Flash Descriptor:
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Make backup of your current bios with Efilash.exe or reading chip via clip and backup up it to the cloud. Never ever change backuped file.
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Read this disable Intel Flash Descriptor
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Read it again.
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Make efi-bootable USB-drive and download this, Boot from usb-drive and somewhere there is value HMRFPO or something similar mentioned on Flash Descriptor topic. Set that value disabled and save and boot. Edit. value is in IntelRCSetup somewhere in security settings.
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Try safe bios with Intel FPT tools you need version 9.1 and if this doesn’t work if you still have Flash Descriptor on.
But if you don’t get Flash descriptor error. Everything is fine and you can Flash modified bios files using Intel FPT.
I don’t remember if I had jumper set near chipset which disabled Intel Me. But I do recommend this.