B450 MSI BIOS ISSUE

[DMK]

I recently RMA my B450 MSI Gaming Pro Carbon AC. I got my replaced motherboard but the BIOS version was Old and many of my motherboards features were not working. The BIOS version that came flashed with the replaced motherboard is E7B86AMS.1D0 (Screenshot attached : https://ibb.co/KLnbnJt ). A quick search reveals that this BIOS belongs to MSI B450 Gaming Plus series instead of Gaming Pro Carbon series. (screenshot attached of my motherboard model- https://ibb.co/72g4nr3 ).
Now I tried updating my motherboard BIOS but MFlash only detects USB drive and not the BIOS files (BIOS file does not exist). I tried using different BIOS versions of B450 Gaming Pro Carbon AC (E7B85AMS.190) versions , tried using diffent USB drives, tried FLASHBACK+ (Blinked 3 times then Constant ON). attached USB drive contents.  https://ibb.co/6XKfZ87
How do I solve this issue? someone please help me.

LINKS-
1) Preinstalled BIOS on Replaced MOBO: version -7B86v1D
https://www.msi.com/Motherboard/support/B450-GAMING-PLUS
2) BIOS of my MOBO that i want to flash - version-7B85v19
https://www.msi.com/Motherboard/support/B450-GAMING-PRO-CARBON-AC

[Bombastinator]

All I got is it Sounds like another RMA combined with a strongly worded note.  Which you probably already knew.  

 

There might be better advice around.  Could take a while.

 

Seems somebody screwed up at the factory.  The problem is this bios is messing things up and it’s hard to tell what.  Some stuff but not other stuff working implies subtle changes.  I’m looking at the pro and carbon boards on the MSI site but nothing jumps out at me.  They both have bios flashback.  Might be differently implemented.  Will the bios only flash off USB?  With a weirdo error like this it might work off something else.  Kind of a desperation move to only maybe try in order to kill time while waiting for the RMA to sort itself out.  That often takes forever