If a second-year CSE student is more interested in ECE subjects and hardware work rather than coding, what can he do now?

If sessions of 2nd year did not start yet, I suggest you to request your college authorities to change your branch, so that you may get the branch of your interest. As someone told you that fill a form of GATE in ECE this is not possible as you are pursuing CSE so it's not possible to fill GATE in E

Fill the GATE form with ECE bro.

Hello, You can change your stream if your college permits. This depends on the terms and policies of your college. All the best.

You can change your stream if your college allows you to.

You can change your stream if your college permits. This depends on the terms and policies of your college.