BIOS/UEFI recovery from USB?

This is one of those dreadful posts that I have determined may just be one the only remaining options to revive my X1 Carbon Gen 9 after a power-on attempt a few mornings ago and have exhausted other options (reset button, battery removal, CMOS battery removal, and reinstalled.

The device does perform the LCD panel test, powers external USB drives (as indicated by their lights), and currently when connected to a USB-C charger, the LED charging indicator turns amber for about .5 seconds, then white. The white LED to the left of the power button flashes three times, indicating it has detected a charger present.

After about 6 seconds, the white LED charge indicator between the USB-C ports turns off.

About two seconds after it turns off, it repeats the process of indicating a changer present, the white LED flashes three times, and the LEDs for ESC, F1, and F4 begin flashing at a fast rate and non- sequential. From what I have read regarding the “memory relearning” process, what I am seeing is much different. I did hear the fans spin up one time, but very briefly.

I have not noticed the display turns amber on to display any of the POST process; only the LCD RGB test invoked with Fn and Ctrl. This works without the AC connected.

Also, worth noting is that the LED indicating the charging status that is normally white turns off after a few seconds. If the power button is pressed, the LED turns on indicating it is charging again, and the power button flashes three times indicating a charger is sensed.

Is anyone aware of a BIOS recovery USB that it may be seeking although the display is off? Or a technician key combination that could possibly roll back any corrupt BIOS data? There have been no beeps during any of this process.

I don’t think the current version of the maintenance diskette (USB now, I’m sure) would be of any assistance or not?

Thank you for reading and for any recommendations you may have.