This is the easiest method. A pre-patched PKG file is a single installation file that has the base game, the 1.09 update, the DLC, and even some mods already merged together. You can use a tool like Duxa's PS4 PKG Repackager to create these.
The primary reason to install this specific v1.09 package on a modified PS4 is the ability to break past the constraints of the original hardware. Here are the most prominent modifications compatible with this build: The 60FPS Patch (Lance McDonald's Framerate Patch)