[Request] Compaq 610 WWAN Whitelist Removal

My system
-Manufacturer: HP Compaq 610
Bios file
http://ftp.hp.com/pub/softpaq/sp55501-56000/sp55870.exe

My current Bios version is also F 20. I found in forum F08 bios mod but I cant flash because the system say" cant downgrade.

Please help me mod this version. Thanks