I was looking on MSI site and it says it should be FAT32 (right click on usb drive> properties, and see which format it is; format otherwise).
Here (1) I found nice guide that might be helpful. And
here (2) one linked from your specific MB. I see you tried multiple versions, but just make sure you have te right one and go for under dos mode as explained in link 2. To make it bootable, suggest using
Rufus. Just select under "Boot selection" "Free DOS", and select your flash zip file.
If nothing works, maybe clear CMOS first, make sure it is clean, and then start all over.
I hope you'll fin the solution.