Comment # 39 on bug 1203748 from Giovanni Gherdovich

(In reply to Stefan Dirsch from comment #38)
> 
> Successfully done. :-) Closing ...

Nicely done!

To recap: your system is legacy BIOS, the vendor offers BIOS updates only via
UEFI capsules and their only documented update method is with the Linux tool
fwupdate(1). fwupdate doesn't work if the system uses legacy mode. So what you
did is use a (uefi) live image from a USB disk with fwupdate, run the update,
and then continue use legacy mode on an update firmware. Am I getting this
right?

This kind of shows that there is only one firmware; I somehow always assumed
there are two, one legacy and one uefi. But apparently you're always running
the uefi BIOS, only it has a thin compatibility layer on top so you can keep
using the old interface. Does that make sense?