Please help. I'm looking for a reliable BIOS update, and if available, also for the EC.
The laptop turns on but displays no image. When I update the BIOS using files available online, the laptop stops turning on and the power button flashes three times.

Laptop :
Lenovo ThinkPad X1 Yoga Gen 5
SN : PF-2D7PT6
Type Number : 20UB-002NPB

Motherboard :
GX490 NM-C661
Rev : 1.0
CPU : SRGKW

I am attaching the original BIOS file.
Thank you very much in advance for your help. 🤗​
​...