Downloaded several images onto a known good usb stick but doesn't want to detect the image and proceed to flash.

It currently has black hole 3 that was updated over the Internet, but it could do with a new more recent image.

Any help please. Tried various USB sticks and all USB ports on the device all with no joy.

I have tried this several times on occasions and ran into the same problem.
Followed the guides available and can even explore to the USB stick and see it available but doeast detect the image.

Have extracted the image to the root of the USB stick.

I thought I'd shout up on here and see if anyone could throw a few pointers as to why it is not working

Thanks