Komatsu 220 aux plumbing/single to double

I'm trying to figure out how to change over the aux plumbing from a single acting to a double acting, on a 2008 Komatsu 220-8. Long story short installed a thumb and it would only move one way, did some research and and think its only plumbed for single acting. Only one of the lines coming off the boom goes into the valve body (Image 1), the other does a 90degree bend then(Image 2), around the valve body and into a valve of some sort (Image 3) , then towards the tank. Any help or direction would be greatly appreciated.

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Komatsu 220 aux plumbing/single to double