EDIT: False alarm.
After doing this procedure in 2020, I somehow remembered "Add New Boot Option" was part of it (it was not). Just now was able to add the nvme bootup to v.3.4 bios and got all the goodies: nvme boot manager, bifurcation, add new boot option (that no one needs lol), etc.
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@eholyst Could you please send me a modified bios for x9dri-ln4f+?
I modded v.3.3 bios a few years ago for a single disk card. Last night saw some posts about quad cards, latest v.3.4 bios supporting bifurcation, etc. Flashed with stock v.3.4 bios and it no longer has "add new boot option". Stock v.3.3 bios is nowhere to be found. Supermicro Support not responding. Still kicking myself for messing with a working system! Don't know what else to do now. Please help!