I don’t think this is the right choice. Again you have to spend four years, man. I feel you can learn a lot of computer science skills online. You don’t have to do B.Tech again. One thing you can do is you can learn all the introductory courses online, and you can make a fresh resume and start applying to software companies.
If you think that who will believe what you have done, you can probably go for certification courses, and you will have proof. Anyhow, if you would register yourself for B.Tech, then you would have to spend lacs of rupees on college. Instead, you can go for these online courses and learn a lot. You don’t need to do B.Tech again. There are various computer science courses available online. You can choose any and work on that and deep dive into them. It would help if you had a solid reason to change the profile for interviews. So, learn online and command all computer science skills without doing B.Tech again.