Where is the BIOS flash in HP Elitebook 2760p laptop?

[archlinux]

I'm going to remove the whitelist of my HP Elitebook 2760p, however, the flash program needs a signed ROM file so it's impossible to modify the ROM to flash. So I want to modify the firmware with an external programmer. I've disassembled my laptop, but I can't find where the flash chip is. I used flashrom program and detected it may be a 8MB Macronix chip, but I didn't find such a flash chip on the board.

Thanks.