Using the SNESxFlasher (Flash Boards) - MouseBiteLabs/Super-Nintendo-Cartridges GitHub Wiki

I have not personally used this flasher, so I will defer to the insideGadgets website for proper instructions! https://shop.insidegadgets.com/product/snesxflasher/

You can ask for technical support on their discord: http://discord.gg/X2wS8eh