Pc Upgrade Fail

Hey guys, I recently tried upgrading my Ryzen 2600 to a 5600 on my MSI B450 motherboard.

I stupidly didn’t upgrade the BIOS beforehand but this has now been done and it’s still not posting. I’m getting a red cpu light on the board.

Any ideas on what could be wrong?

Annoyingly, I broke a pin on my 2600 so I can’t even just revert back to that