Do I or don't I  

Gotta go out.
I suggest NOT using a Windows flash utility.

I suggest you copy the file G750JMAS.207 to a USB stick formattedFAT32 and plug that into a USB 2.0 port in the laptop. Turn it on and go into BIOS and use the EASY FLASH utility in BIOS, just like post #15

Actually TV I was surprised to see that I could not get that BIOS files again for some reason and clicking on the BIOS Utilities in support it brought that up and I just thought I t might be the thing to use to get the BIOS update installed. Notebooks & Ultrabooks - ASUS ROG G750JM - ASUS

To be honest it just seems like one thing after another with this machine and the Asus support contact site and the ROG forum are as useful as an ashtray on a motorcycle.

I can download the BIOS file from here.

Well mate I ma as confused as you because all I get is that file which will not open without some program to do it.

Mind you I have a problem with my security at the moment causng other issues and Kaspersky have assured me it will be fixed by next week as I ma not the only one having problems. I might even uninstall it pre tem and do what I have to do.

Are you sure about that? Because that file (G750JMAS.207) is all you need. You don't open it with another program as if you were in Windows, you just point Easy Flash to it and away it goes.

Or is it that you can't extract it from the Zip folder?

I really don't have a clue right now mate as my security I have just found out from Kaspersky support has quite a few bugs in it ie I cannot use PayPal without KISS wrecking my pay method and some fixes they sent like resetting the ?host controllers and deleting some temp files have now got me to this stage of play.

I have just uninstalled and reinstalled KISS to see if it makes any difference in case the last install was corrupted but it is rather wearing on one's nerves.

I shall return with what I can do.

Well downloaded it again and extracted it to a small stick and get this when I try to open it because I have no idea if it is a .cap file or if it will work with the flashing and I don't want to leave anything to chance.

I'm confused about why you are trying to open the file in Windows? The file can only be opened by EzFlash in the BIOS. It is completely fruitless trying to open it in Windows.

The steps go something like this:
1. Download the most recent BIOS iteration from the ASUS website. Store this to a USB device.
2. Boot to BIOS. Navigate to "Tool," then "EZ Flash."
3. Select the USB device. Select the file. Press 'enter.'
4. Check the BIOS version again to ensure the update was applied.

See TVeblen's post #15 and #21.

No Colin I wasn't trying to open it for the heck of it just that the first time I made a stick it came up as just the BIOS update and I left that at my place and when I downloaded this time it came as a zip I thought the utility they quoted would do that. I shall try the stick when I get back to my place and find the stick which I originally made.
All in all this machine has been a very trying experience (since October) and with hindsight I would have bought something similar elsewhere

Why the heck Asus did not make it with the access to 7 drivers as well as the 8 drivers I shall never fathom out the wifi came with an update for 7 & 8 driver but that is all. Am so disappointed with Asus as I thought they were smarter than that. To have to go to all this trouble with the BIOS is to me at least a nonsense.

Your'e going to have to bite the bullet and try it at some point John.