Well, I don't have it out right now but what you are doing is changing it from Arkin firmware to DNT firmware and you use the DNT phone app to do it. You no longer use the Arkin phone apps. You have to get the DNT app for your phone and Wi-Fi connect it to the Zulus to do the update that changes it to DNT and improves it. After you have it updated when you turn it on it will say DNT not Arkin. The app is a little different and the options on the Zulus are a little different, like you can save 5 configurations in the Zulus and pick the one you want to use like for different guns or different ammo. Also, the menu for zeroing your scope is also for picking sight options now rather than doing it on a phone app. Loading the ballistic table is a little different also but it all works well.