Hello Anurag,

Yes branch transfer options are available in NITs. It will be based on you first year performance.With a GPA of 9+, you can transfer to ECE. However, the exact GPA cutoff can be different for different NITs, and it depends  the merit of students applying for branch transfer.

For example, for guidelines regarding branch transfer in VNIT, you can visit this link:

http://vnit.ac.in/academic/wp-content/uploads/2018/08/Change_of_Branch_2017_Admitted_Notice.pdf

Best Wishes.