Lenovo G480 (20156) upgrade to i5-3230m

around 3 months ago, my cousin gave me his used lenovo g480 (20156) with no processor (had overheating problem and removed, but he doesn't know the type). So recently i bought used intel core i5-3230m and put it in g480, i bought it because in internet, there are g480 model that use i5-3230m.  
I use windows 7 64 bit and it works normaly, but after 25-30 minutes the laptop turn off, i tried to rebooting/restarted multiple times, but the turn off problem still occured.

here what i already do
-  tested processor i5-3230m with another laptop and it works fine (no turn off problem)
-  tested another intel processor (celeronb820 & b840) and it works fine to (no turn off problem)
so i think, its not broken hardware

in some internet forum , i read this happen because intel put something like lock function/timer function to prevent higer generation processor work in later generation chipset. In other forum, it said the function can be unlocked by mod bios or microcode, and thats how i get this website link 

So, can anyone help me ?  what must i do to unlock or make bios mod? what must i prepare in case, its not worked? i'm really newbie in this stuff

i use 62CN40WW bios version


and here my notebook information, i used celeron b840, because to prepare this post it takes more than 30 minutes, and if i used 15-3230m it wouldbe turned off before i finished.

Thank you very much