BTech is a four year UG degree course in Engineering. Now as you have done Diploma then you have to give lateral entrance examination namely UPCET. This examination will offer you admission directly to the 2nd year of BTech in Electronics and Telecommunication in any college in UP.

To know more about UPCET visit the link below:

https://engineering.careers360.com/articles/upsee-lateral-entry

Some of the colleges you may get via UPCET in UP:

Integral University, Lucknow

AKGEC Ghaziabad - Ajay Kumar Garg Engineering College

IET Lucknow - Institute of Engineering and Technology

GL Bajaj Institute of Technology and Management, Greater Noida

Sharda University, Greater Noida

The course fee for the college offering the course can be around Rs. 4lakh for Government colleges approximately (it can be less) and it may go high to Rs. 7lakh for private colleges.

For more colleges you may visit the link below:

https://engineering.careers360.com/colleges/list-of-electronics-and-communication-engineering-colleges-in-uttar-pradesh

I hope this answer helps. All the very best for your future endeavors!