you are confusing the BIOS and the EC-ROM.
The BIOS Update package from Lenovo contains a file called *.FL1. It contains the EC-ROM. In order to generate a flashable image for the EC-ROM you need to cut off the first 32 bytes from the FL1-file and then expand it to the desired size with 0xFF.
The BIOS Update package from Lenovo contains also a FL2-file. This contains portions of the BIOS but it is not sufficient to generate a flashable image for the BIOS....

I meant "I flashed the file ..."

Push

as described above: the resistance of 5VALW to GND is 400 Ohm.

RPT3 has 3,2V on one side and 3,0 V on the other side.
UT2 pin 33 = 3,2V
UT2 pin 32 = 0 V
UT2 pin 11 = 0 V...

The output of the load switch is 0V.
Resistance to GND is 550 Ohm (my reference board also shows 550 Ohm).

UT2 gets 20V at Pin 31 (VBUS_IN).
I checked the soldering from all four sides using a microscope. It looked ok.

The EN# signal has 3,2V to GND.

I have an E14 Gen 4 AMD that shows no signs of life.
When connected to the charger the board initially drew 30 mA at 10 V.
The thermocamera showed a hot spot at one edge of the PD controller. I therefore replaced the PD controller, after which the board drew 5 mA at 20 V.
Further investigation revealed that the power switch UT5 (NX20P5090UK) was not activated. The EN# signal is missing. This is supposed to be generated by the PD controller.

From then on I started using the battery instead of the charger.
With the battery the main power rail V9B+ is present...