I am having issues downgrading my cpu. 

Specs:
MSI x470 carbon pro 7B78
32gb 2133 RAM
RX 590 GPU

I get the BIOS Light of BOOT solid. 

I checked the BOOT DRIVE it works (Running it now w/r7x)
I reset my CMOS
and unplugged the GPU because of the embedded graphic chip on the 5 still BOOT
I plugged back in GPU
BOOT light
Pulled the battery 5 mins
Checked the PINS on the 5 and its seating
BOOT light
Plugged back in the 7 and the COMPUTER fully booted. 

I want to downgrade so my plex users can use the ryzen 5 for transcodes (8trans) and I can use EMBY with the GPU since it can only handle one at FULL res. 

What could be going on?There is a Bios update for your motherboard to support the Ryzen 5.

Version
7B78v2H2(Beta version)
Release Date
2021-02-04

Description
- Updated AMD AGESA ComboAm4v2PI 1.2.0.0
- Optimized and support AMD Ryzen 5000 series processors.
- Optimized Resizable BAR (Re-Size BAR) function with NVidia Graphics cards.
- Improved AM4 processor compatibility

Here is the Download link https://www.msi.com/Motherboard/support/X470-GAMING-PRO-CARBON