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DC7900 what can prevent bios to update ?

HP Recommended
DC7900 SFF
Microsoft Windows 7 (64-bit)

My experience as a user is above average and I have implemeneted last bios to a number of motherboards like Asus, Gigabyte, MSI, Dell, HP and some Laptops like Asus, Fujitsu and HP.


I have tried several times to flash the bios as described in HP manual

from cd or usb, from the current bios of the machine (v.1.08) to the latest bios as it stands in the HP list of BIOS (v.1.27 and even v.1.26)  without success.

Post here:


I suspect that there is something that prevents the bios update but so far, in the HP documents is not clarified if there are any setup options that prevent bios frombeing updated.


In the document Illustrated Parts & Service Map: HP Compaq dc7900 Small Form Factor Business PC

page 3 main board overview there is information about header E49 (shortened with green jumper)

which has aside 2 more pairs of headers that are not described.

Can anyone answer what are these two pairs of headers doing and what is their direction (e.g. parallel with jumper or vertical ?) could one of them is the key to bios update failure?

Illistrated motherboard dc7900 3 jumpers.jpg


Any response to this annoying update procedure failure, would be much appreciated.


And if someone can give me suggestions how to pass this issue to an expertese, it would be great.


Thanks for the hospitality and for the time to read .








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