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HP Microserver Gen 10 Plus Raid
(alien.top)
I have also had issues with Microservers and even HP PCI cards. Can you in BIOS disable firmware on the PCI slot? Dont remember if the microserver bios have that feature.
I don't think that the P420 is supported on the newer microservers, I remember from HPs manual, the only listed raid controller was the p408i-p. Doesn't mean that the older ones aren't supported, but HP doesn't officially support them
This was my thought, although it's not officially supported, I was hoping it would still work, I just wouldn't have all the features.
As an update, I've managed to get it working by having the bios in legacy mode rather than UEFI, I just now have a power consumption issue to deal with.