Odin is a very powerful Samsung Software that came to know a few years back, and which acts for firmware on your Samsung device. It is a utility software developed and used by Samsung group. Odin download has not officially released to the public, but few years back it was leaked unintentionally. As it is a very powerful tool you have to go through the instructions well before you proceed with it. Because it is beneficial only if you use it properly, in the other hand it can brick your phone in a second if you are messing with the process.