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Thanks for your help on this. Actually in the end I tried installing a copy of win 7 on the unit and that installed fine. From there I was able to apply the Dell bios exe in windows and that updated it OK. Im now going to try installing windows 10. Thanks again

Thanks for your help Michael. Do you think this is the likely problem here? Is there a way to tell that its trying to read the USB or is the only test to take out all the HDDs and then just type dir and hope it lists the files on the USB? The command prompt starts with C:\> so should it just...

Hello Michael, I have just bought a second hand C6220 and it has the original bios so I have followed your guide to update it. However I am no expert in DOS. I cant get your first command to register C:\bios\bios.exe it just comes back as invalid command. I would imagine that C: points to the...