How to update the BIOS on an Asus M50Vn laptop

I’ve had lots of problems with my M50Vn lately, caused by my tries at upgrading the graphics drivers for the GeForce 9650M GT (see this post, which I’ll update soon, once I’m sure the BIOS update fixed it). To summarize, any NVIDIA graphics drivers version 186+ would cause massive flickers and freezes, and it turned out that a BIOS update could possibly fix this. So I decided to give it a try.

First I grabbed BIOS version 212 from here (mirror) (search for M50Vn, then choose any OS (the BIOS updates are OS-independent).
Then I went to the instruction page Using ASUS EZ Flash to Update BIOS. It may help you to find how to load EZ Flash, otherwise the other instructions aren’t that useful: they say you need to unzip the BIOS file to a floppy or an USB key… Great, the M50Vn has no floppy drive, and I don’t have a spare empty USB key. But actually, you can just unzip the BIOS file on your first partition, in the root folder. I unzipped it into C: (so, C:\M50VAS.212).
Then it’s simple:

INSERT THE (charged) BATTERY: in case of a power outage, you’ll be glad you did
Restart the PC
During the early boot, press F2 to enter the BIOS (yeah, on their guide they got the keys wrong, at least for the M50Vn)
Find EZ Flash (I already forgot where it is, but seeing how raw that BIOS is you’ll find it easily) and launch it
Find the BIOS update file, and use it to flash the BIOS
At the end of the process, you’ll get a success message and the PC will shutdown. Congratz, you’re done Without a floppy, and without a USB stick