I am trying to flash Gargoyle onto my router (WNDR3700v2). Sadly my hardware knowledge are mediocre at best. I am not completely certain how to directly flash Gargoyle onto my router. I have a "hunch" that it is simply upgrading my router with the correct .img file. But as most hunches, it's not completely certain. The installation guide on this website mentioned I could also use openWRT Kamikaze to do this. I am completely lost on that website, however. When I visit the download page on that website, I get a list of folders with names I am unfamiliar with.
Can anyone confirm whether my hunch is correct? (The hunch being: simply use the router upgrade function from the Router UI)
In the scenario that it is not correct, could I ask any of you to explain to me how I can directly flash or download and use openWRT? (please explain as simply as possible

Thank you!