In times like this, a good relationship with your retailer can make your life much easier. I would ask the retailer to sell me a BIOS chip for the board with the latest Bios version already burn in the chip. All I have to do is swap the chip. I did it with my SuperMicro & Epox boards. I haven't tried replacing an MSI chip but I'm sure it's the same.
You could try contacting MSI direct if your retailer would not give you service.
BIOS chip is usually about $15 including shipping.