You don't have to do that. You can either use the official way which involves flashing an update via emma (windows only tool) or do essentially what flashing via emma achieves from recovery (as explained here, search for "the linux way").

So if you don't have any problem using windows it's probably the best way to go the official route and use emma.
If you already have an community build installed and don't want to use windows the instructions at the top are probably the easiest but if you don't have an community build installed and don't want to use windows the instructions I linked are the way to go.

Keep in mind that all emma-less ways are strictly unofficial right now.