Gear up ...
Raise the back of the laptop, use a cooler like Deepcool Multicore X6 maybe.GPU temps are always fine. I think re pasted the CPU and GPU last year with IC Diamond. I just thought undervolting will bring the temps down that is why I want to try this instead of opening the laptop again. According to the throttle stop guide I am unable to find the FIVR option.
I think its not possible. Found similar thread where people are telling this FIVR option was only available after 4th gen.