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I wiggled the boots back and forth a bunch while pulling till they came off. One of mine was a bit tough so I took a set of plyers and used it for a little bit more leverage. Don't squeeze too hard or you'll crush the ring inside the boot.
When you put the boots back on, make sure to spray a little bit of silicone spray (available at any auto parts store) in the boot so you don't run into this problem the next time. Good luck...