How Can I get code from Particle?

Hello, im new here.

I have an particle boron 2g/3g kit. Can i take code which is loaded it earlier?

Hi! Welcome to the particle community. What sort of code are you looking for?

I have an ready system which include a particle boron. I need to change some parameter changing to optimise the system.

What do you need to change? Have you checked out the Particle docs?