The XOF patches in Metal Gear Solid 5 Ground Zeroes are more than just a collectable, youll need them to unlock the PS4s exclusive Dj vu missions and ultimately a MGS1 PS1 Snake & Cyborg Ninja skin. Dont worry if youre having trouble though as here are all the locations.

To unlock Snakes pixely PS1 incarnation youll have to find the patches below then complete a series of objectives to recreate moments from the first PlayStation game. To get Cyborg Ninja you then have to do the same on hard.

Probabably the hardest patch to find becaus unless you know about it theres no chance of locating it its stuck to your back right at the start! To get it you need to lie down and aim then click the left stick to roll. Keep rolling until a cutscene plays which then lets you pick up the displodged patch.

Another tricksy patch to find is located right at the start as soon as the game begins turn around and go back to the cliff edge where youll see the patch next to some bushes.

Find the entry gate near the watchtower as you approach the camp. Pick the gates lock and go through, following the road around to the left hand side. You should see a gap in the fence on the right. Go through it and look for some planks and an oil drum. Youll find the XOF patch on some rubble nearby.

See the article here:

MGS 5 XOF patch locations: where to find them & unlock the Dj Vu mission