Yeah it's the same for me in the "AMD Firmware Version" menu. On what other slot would the bifurcation be though?

Not familiar with that board, but looks like it’s got 2 x16 slots?

As you have Linux, regardless you should see an extra PCIe bridge with ‘lspci | grep GPP’.

lspci -vvv would show what bandwidth

No new PCI Bridge shows up when I activate bifurcation

Oh well - thanks for checking.

Perhaps I do indeed just have to change board.

Certainly learned a lot, so thanks.

News flash - found a combination that worked.

1. Download A40vA6 2019-03-07 - the version just before Ryzen 3 / Zen 2 support http://download.msi.com/bos_exe/mb/7A40vA6.zip
2. Modify as per this thread
3. Flash from a flash utility of your choice (M-FLASH on BIOS will refuse to downgrade)

This time choosing the 2x8 option does the right thing!

Of course - the only downside to this is I can never update to a Zen2 processor with this board and keep the 2x8 functionality.

@jason098 - do you know a way to upload the rom to this site, so I can put mine up here? There's various sharing sites, but they tend to bitrot.

Well, I'd just upload them to Google Drive, Dropbox or something and share the link.

Edit: You can attach files in posts, not sure how big they can be though

Yes I tried and 16mb too large. Will try compressing tomorrow.

Trouble with self hosting is it has to be there for years.