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On the IPMI home page for the machine being updated, find the 'BIOS Update' menu item.  For the drp-srcf-cmp* machines, it is in the Maintenance menu, as shown in IPMI page.  This allows you to browse to the BIOS file and initiate its loading. 
After selecting the BIOS file to load and clicking on 'Upload BIOS', the system presents a screen on which one can select to 'Preserve NVRAM' (deselected) and 'Preserve SMBIOS' (selected).  It's not clear what's correct, so go with the defaults.  Also check that 'Existing Date' and 'New Date' are as expected before clicking on 'Start Upgrade'. 
After a while the loading will complete and you will be asked whether the system should reset.  Go ahead and do so, being prepared to stop the boot process at the BIOS setup stage as described in Getting to the BIOS screens, above.  Since a number of the BIOS parameters will have been reset to their default values, they will now need to be reconfigured to their old settings.  Note that in the new BIOS version, some parameters may have disappeared, moved to different subsections, renamed or reordered with respect to the old version.

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