Probably won’t help but i’ve got the same problem.
New computer with SN 850 1TO and Msi x570 gaming edge wifi.
SSD was on M2_1 first start arrive on msi boot then after restart windows lanch normally.
Then i download WD Dashboard and upgrade the firmware from the SN 850 (614900WD).
Now the SN850 was never found… and the system doesn’t start.
I change theSN850 to slot M2_2 and it’s work fine ! (But haven’t got anymore a heatsink…).
Slot M2_2 is in pcie 3.0
I’m having an issue where I’ve updated to the latest sn850 firmware. I’m on x570 crosshair hero viii with x2 sn850. Now my games are freezing and crashing and then when the game closes one of the drives are no longer showing untill I reboot. Where can I find an older firmware to go back too?