ASUS X53SV-SX239V I7 (board K53SV rev 2.3): BIOS dimension

[Fulcro]

Hello. 
This notebook is completely dead and I haven't found any hardware issue. I would try to flash the SPI BIOS directly desoldering the chip from the board and burning with my programmer.
I'm searching the BIOS file for this notebook, but every file I've found has a dimension of 2560Kb. Since the BIOS is contained in a Windbond 25V032 SPI memory, so BIOS file is 4096Kb I'm in doubt on how to work in this situation...
I haven't found any other memory in the board, so the only flash is the 25V032...
Comparing the files (original and downloaded from ASUS) it appears that they are completely different...
I attached 2 files:
K53SVAS (from ASUS site): 2560Kb
25032 (from the chip of the board): 4096Kb

The BIOS updates from ASUS can be found here:
http://www.asus.com/IT/supportonly/X...pDesk_download

Anyone have a clue?
Thanks a lot
Fulcro