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....

@MeatWar @CodeRush @Lost_N_BIOS @lfb6 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.

@MeatWar @CodeRush @Lost_N_BIOS @lfb6

What I plan to use:
Programmer - CH341A green (3.3v). The one I order from Amazon "CH341a BLACK" and it came broken and not working. Also it need to be modified for correct voltage.
Clip is also so so bad, but at least I can use adapter.
Better clip - SOIC Test Clip 8 Pins 2.54mm, Pomona
Jump wires - Female to Female
or in case clip cant reach: Mini Grabber Test Clips

Software & computer:
MACBOOK PRO: (Terminal Homebrew - flashrom)
or
Win10: AsProgrammer (Version 2.0.3a - with support for MX25L25673G)
Latest CH431a driver for Win10: CH341PAR.EXE (ver. 2.2 - 2021-10-16)

What is the plan for getting my 4500€ machine run again:

TRY 1 (Mac or Linux):
1. Disconnect everything on the motherboard and pullout the battery
2. Connect properly wires to clip and over adapter connect to CH431a
3. On the MAC install flashrom and try to read bios and backup in to .bin file for couple times and compare with files with hash.
:~$ sudo flashrom --programmer ch341a_spi -r backup1.bin -c "MX25L25673G"
:~$ md5sum backup1.bin
4. Send to someone from this forum to prepare the BIOS for flashing. Cos I don't wish to lose UUID and serial. Using the stock BIOS file (7C73v1A):
5. using flashrom try to install prepared bios
:~$ sudo flashrom --programmer ch341a_spi -w bios.bin -c "MX25L25673G"

TRY 2 (Windows 10):
Same steps as for TRY one except using Win10
1. Disconnect everything on the motherboard and pullout the battery
2. Connect properly wires to clip and over adapter connect to CH431a
3. Install latest driver for CH431a
4. Install AsProgrammer 2.0.3a
5. Read the BIOS and save it to file couple times
6. Compare md5sum
7. Send to someone from this forum to prepare the BIOS for flashing. Cos I don't wish to loose UUID and serial. Using the stock BIOS file (7C73v1A):
8. Flash the prepared bios to chip and verify

I hope, with help of all you guys, we can fix all the boards that MSI bricked with they irresponsible behaviour giving publicly BIOS update that breaks motherboard.

Looks like you did some reading already- very good. The plan looks OK, but I can't comment on the commands- no experience with flashrom software.

Storing machine specific information is done very differently by the different vendors. It will take you some reading to find out how this was done for your bios, how to repair you dump or how to prep a stock bios with your machine specific data. It might be a good idea to attach the bios dump of the bricked bios or a link to it here.