I read the info at the link and I’m still not entirely clear. Is the firmware on the SD after it has received a fresh OS or is the firmware actually on the PI?
If it is on the PI then I can’t get any video so how am I supposed to update firmware on something that I can’t see?
I've never updated firmware on the card, but the usual procedure would be to do it from a PC using software that allows you to access the firmware though a USB connection from the PC to the card.
You shouldn't have to do this though unless somehow the firmware has gotten corrupted. Updating it can be a pain sometimes, and you might need another USB driver for your PC.
In any event, working with these cards is a learning experience and that is actually what the designer had in mind in the first place. :-)
After looking in the guide book, looks like the PI firmware itself is protected - and therefore not accessible. Also, make sure you have the SD card inserted all the way in.