Sure you can, but you need to read through a lot of stuff before you attempt to do it. Otherwise you could destroy your receiver. Technomates, manhattan, Kaon, Humax are some receivers that you can do it with. So start reading in the revelant sections. Start with Technomate 1st.
Some Cozzies can be flashed with alternative software. BUT you need to find out if anything compromised is available in India before you start playing with patches. Most services receivable in India seem to be screwed down tight at the moment