Hello forum users, my friend recently bought a refurbished Latitude 7440 and i'm trying to update the BIOS on this computer.

pc spec:

• I7-4600U
• 16gb ram
• 250SSD

Other:

• Battery health = Excellent
• Ac adapter = 90W

i currently have A12 and im trying up upgrade to A28.

when i run the E7440A28.exe everything is normal, program loads up and the computer restarts.

My problem is that after the restart when the flash is supposed to start, it just loads for ~20sec on black screen, then a few sec on Dell splash and boots to windows.

what i tried so faar:

• Just running the .exe file 
• F12 -> Flash BIOS update
• Flash with Dell's Bootable USB (https://www.dell.com/support/article/us/en/04/sln143196/how-to-create-a-bootable-usb-flash-drive-using-dell-diagnostic-deployment-package-dddp?lang=en)
• Flashing using Freedos
• Turning secure boot on/off
• Turning virtualization technology on/off
• Downgrade to A01

Iv tried the A13, A25 and A28 update with the same results. whatever method i use loads up the update and restarts the computer.

the only error message i can give you are from BIOS->system logs->Power events->"Power on - not applicable".

iv done everything i can think of.

What is my next step?

thanks

-Felaron