Ha no one? Let me check an older hdd that has portablebenchmarks 1.5 installed, should have 4.25 kit there.
EDIT: nope, check if someone has the installer of portablebenchmarks 1.5.
You can't change multipliers on U cpus, only XM are factory overclockable. Also, if you want to change BCLK you will need an 'unlocked' Management Engine Firmware written on your laptop.
Let me know if it worked, the tool used is known for corrupting some bioses.
http://www.cpu-world.com/cgi-bin/SearchSite.pl?SEARCH=0665h&PROCESS=Search