It should be this file
which you need to extract onto a FAT32 formatted USB-stick
so only the file
E7A36AMS.H75 is on the drive.
If you put the unextracted .zip file onto your USB-stick M-FLASH won't recognize it as applicable.
Preferably the smallest USB-stick you've got as there have been some issues with larger sized (in terms of GB) ones in the past (although idk if that still holds true nowadays).
Alternatively you could try to update with Live Update 6 (according to the manual) or whatever the current MSI software solution is called atm (MSI Dragon Center or just MSI Center I believe) in Windows - that will search automatically for updates for your motherboard but it is usually seen as the riskier update process (as in: chance of bricking the board) compared to doing it via M-FLASH or USB-flashback directly.