I struggled with the screwdriver method, couldn't quite get the right angle, didn't know how hard to push, etc. I had better luck jamming my hand back there. My tips:
Have a couple rolls of paper towels handy to jam under the seat back. One is enough until you bump it and it jumps out of the truck.
There's a plastic 3/8" x 3/8" x 2.5" thing back there that feels very much like a latch, but isn't. If you can feel that, the latch is just forward of it, wider and flatter, thin & bendy. Pull that wider thin part back, only about 1/4", then lift the seat back and jam in your paper towels.
And finally, with both sides unlatched, lift the back, lay it over face-down on the seat and keep going till it is completely upside down, with the padding facing forward and the sharp metal bits pointing up. Take it out that way rather than right side up - it's easier to avoid cutting the headliner a foot above than the seat an inch or two below.
Last edited by ctvarner; 07-08-2014 at 12:47 AM.