Thank you, Peste. I'll do that as soon as I have some time and will let you know.

Thank you for your quick reply, Peste — I really appreciate it!
The I/O chip on this motherboard is an ITE IT8987E.
Let me know if you need a photo of the chip or any other specific information from the board.
Thanks again for your help!...

Hello,

I'm requesting a full BIOS dump (including EC firmware) for an HP OMEN 17-an012nf laptop.

Details:
Model : HP OMEN 17-an012nf
Motherboard Part Number : DAG3BAMBAF0 REV : F
Serial Number (S/N) : 5CD7280D51
BIOS chip : Winbond W25Q64VSIQ
Programmer : EZP2023+
Issue : The motherboard is not powering on. Only the 5V rail is present. The 3.3V rail is missing because EN1 on the SY8286B remains stuck at 0V. This signal is driven directly by the EC/SIO. I replaced the 3.3V regulator and confirmed it's working.

I already...