Usually not... even a board with no CMOS or spi attached can psw for a sec or two, check stand-by 5v, cmos 3.3v and 12v on vrm, if u have the tools.

EDIT: New bios 7C79v1A Release Date 2021-10-18

Same thing here....

I'm in desperate need for help for someone to guide me how to do it properly and not to fry the chip and not to flash it and loose UUID or motherboard serial.

I'm completely noob and doing this for the first time in my life.

Product detail:
MSI MPG Z490 GAMING CARBON WIFI Mainboard Sockel 1200 (7C73-001R) MPG Z490 GAMING CARBON WIFI

Description:
My motherboard stop working. When I turn on the PC it's just stuck in POST and I can't get in to BIOS.
I updated my motherboard with bios release asked me to do from official MSI Center (Win10).
After updating the bios (process went all the way to 100%), the PC will not start at all. I can't even get in to the bios.

Date of failed flashing: DEC/18/2021
Affected board model: MPG Z490 GAMING CARBON WIFI (7C73-001R) V1.A BIOS Release
Flashing method used: MSI Center
Attempted update to BIOS version: from 7C73v19 to 7C73v1A
Result: Stuck at EZ Debug LED "CPU" after update.
BIOS Chip: MACRONIX MX25L25673GM2I-08G (MX25L25673G)

Monitor Black screen
Try reset on JBAT1 - no success.
Try removing battery and wait for 1 hour - no success.