Supermicro 91 error

IT Guy
IT Guy used Ask the Experts™
While a Supermicro system board is trying to boot into Windows it displays a 91 error during the BIOS POST.

I have heard that this error might be able to be fixed by flashing the BIOS.

Where can I download the correct BIOS version to flash this BIOS so this error will be fixed?
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What's the model number?

You can download BOIS updates from SuperMicro via this link:

Enter your model number, and it will take you to the correct downloads.
John TsioumprisSoftware & Systems Engineer
Check carefully your model and get the BIOS from here
Quid, Me Anxius Sum?  Illegitimi non carborundum.
Have a read of the post here

Note I believe that you won't be able to flash BIOS if it is erroring out on you.  I suspect you've got faulty hardware in that box, possibly a hard disk controller but that's a guess from a quick Google search.

What the link essentially states is to disconnect/remove all peripherals and addin cards and to reset the BIOS back to standard and then if you can boot to BIOS to reset it to Optimal.  The method described there may or may NOT apply to your board.  But the principle should still be the same.

Be cautious if you've got a complex setup as this method may or may not destroy settings you may have in the BIOS or any addin cards (does the system have RAID?)
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Scott CSenior Engineer
Don't known if this will help, but I just fixed a Supermicro box today by putting in a new CMOS batter.

The thing wouldn't POST, display anything on the monitor, etc.
IT GuyNetwork Engineer


The Supermicro model number is X9SRL-F
Here's the BIOS file, from the link above:

BIOS File Name:
Size (KB):      3,831
BIOS Revision:      R 3.2
File Description:      This zip file contains BIOS ROM, Flash utility, and Readme instructions. You may download the free WINZIP utility to extract the contents of this file.
RaminTechnical Advisor

What is your current BIOS version ?
Top Expert 2013
did you check your bios battery?  it should read 3V at least - for a CR3032 model

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