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Reason for needing BIOS update:
Nec Driver Update
I wish to upgrade the current 3.06GHz/533MHz CPU (P4 SL8JA Rev OE) which is non-Hyperthreading to a 3.8GHz/800MHz P4 HT SL7Z3, which the Gigabyte site/manual indicates is compatible with the mobo. 
Nec It3530d Driver Download
The machine has Award 2004 version 10v BIOS which has no means of enabling Hyperthreading, so I need to update the BIOS to a 2005(>) HT-supportive version so that the HT attributes of the replacement CPU can be recognized/utilised.
Background:
PB no longer offer any support for this model (<2008 = Too old).
Their “older products” pages (2004~2007 models) ftp://ftp.download.packardbell.com/DESKTOP/ list some Win XP drivers, but no BIOS updates.
I am just going round in circles looking for a copy of a BIOS upgrade which will enable Hyperthreading support.
Any factual input, especially a copy of the relevant BIOS update (does version 20u support hyperthreading?) or a (live!) link to download it would be very gratefully received. Alternatively is there a patch for the current version?
Other OEM BIOSes for the GA-8i915PM mobo do not appear to be compatible with the PB NEC mobo, although would presumably be patchable – for a competent coder (which is not me!).
Download Pb_nec Driver Download
Machine details as below:
Model: Packard Bell NEC iMedia 1508/N
Model Type: UTOW – 8UN
MS WHQL No: 8UN 957446
PID: 0488533
P/N: PB43213001
MIM:
Current Operating System: Windows 7 Professional 64-bit SP1
Original Operating System: Win XP Home Edition
System Manufacturer: Packard Bell NEC
System Model: Packard Bell NEC PB13212701
System Name: 00000000000000000000000
System Version: PB13212701
SNID 041411720075
Chassis No. 50524E
Board: NEC COMPUTERS INTERNATIONAL GA-8I915PM (LGA Socket 775)
Mobo is marked Gigabyte GA-8i915PM 40A254 00725
Northbridge Intel i915P/i915G rev. B1
Southbridge Intel 82801FB (ICH6) rev. 03
Chipset: Intel 2580 Rev 4
Chipset Model: i915P/i915G
Chipset Revision B1
Southbridge Vendor Intel
Southbridge Model 82801FB (ICH6)
Southbridge Revision 03
Super IO: ITE 8712F Rev 7 at port 002E
SMBIOS Version: 2.3
BIOS chip is labelled Phoenix D686 Phoenix 1998 20090956
BIOS firmware:
System BIOS version: Award Software International, Inc. 10v 11/21/2004
POST Screen: 11/21/2004 i915P – 6A79VG0DC-00
Interface Type: Single PATA IDE channel + 2 SATA channels