i5-6400 Non K overclock

I bought my PC from an 8pack bundle couple years ago, came at like 4.40 gHz, and it is on 2.70 gHz atm, how do I make it higher? I am new to it and using the BIOS. I have the z170-e
I think it involves increasing the bclk as the CPU multiplier is locked, have a Google around and I'm sure you can find some guides.
 
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