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Old BIOS/FW versions
Expand title Old BIOS/FW versions BIOS Firmware Version: 1.3
Firmware Version (AKA IPMI): 01.00.32
Grabbing latest BIOS/BMC FW
Expand title Grabbing latest BIOS/BMC FW files https://www.supermicro.com/en/Aplus/system/4U/4124/AS-4124GS-TNR.cfm
Making new folder and unpacking both .zip files
Starting with BIOS flash in IPMI (BIOS Firmware Version)
Expand title IPMI > Firmware Management > BIOS > Next > Select File (bin file within the unpacked zipped folder > Upload 
If your system is powered on, it will ask you to power off the system.
Go back and attempt to 'upload' the BIOS file again in Step 2, it will 'Upload Firmware' for about 2-3 minutes, getting stuck at 70% for a majority of it.
Once 'Upload Firmware' completes, and you regain screen activity and see 'FW Update Mode' graphic displaying in the bottom-left, it will also prompt 'Step 3' to 'Update'; displaying both your 'Existing' and 'New' Version.
It takes about a minute at 0%, then it will progress all the way to 100% in 4-5 minutes, system will power back on near 100% and will stay on 100% for about 2-3 minutes until it kicks you off IPMI to re-login.
At this login screen below, it looks odd, because it is. It will might state 'invalid username/password' on the first time, and redirect you to the 'normal' looking login screen again.
Successfully updated BIOS Firmware Version.
Updating Firmware (BMC file)
Expand title IPMI > Firmware Management > BIOS > Next > Select File (bin file within the unpacked zipped folder > Upload 
System does not need to be powered off for BMC update.
It will 'Upload Firmware' for about 2-3 minutes, getting stuck at 75% for a majority of it.
Once 'Upload Firmware' completes, and you regain screen activity and see 'FW Update Mode' graphic displaying in the bottom-left, it will also prompt 'Step 3' to 'Update'; displaying both your 'Existing' and 'New' Version.
It will gradually progress to 100% in 4 minutes, and then state 'BMC is restarting' for another 4 minutes. At this point, the system's fan will rev up again as-if the system is restarting, and then the IPMI login screen will ask you to login again.
Successfully updated Firmware (BMC) Version.
