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Cannot downgrade BIOS

HP Recommended
HP EliteDesk 800 G1 Base Model Tower PC

I installed  an m2 nvme drive on the pcie slot. The nvme was able to install windows 8 and 10, but I could not shutdown the windows from the shutdown function within Windows 10. I upgraded the bios to v2.77. After the upgrade, the bios doesn't even show the nvme drive anymore. 


I was trying to downgrade the bios within the bios or a usb freedos drive, but either one would let me downgrade the bios. Is there anyway I can downgrade the bios to older verison? Please advise. Thanks.

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