Can you pull the blade, update the CMC and then reinsert the blade? You can back flash the BIOS, but it is something we would want to try to avoid. 
Good day, I am in a bit of pickle . I recently downloaded BIOS and Updated Power Edge M630 and realized that I did not follow the recommended order of updates. The M1000e should have been updated 1st. Now the CMC is non responsive. Any Ideas where I should start troubleshooting this. Can remove the BIOS update?
M1000e Non Responsive after updating M630 Blade Server BIOS