Hi, I have a 986 and to remove the boot you must wiggle it a little and pull it out , it is only holding with 6 plastic clips that are part of the plate holding the leather in place.
Then check if there is a screw holding the knob in place , mine was only press fitted over the shift pin, loosen the screw if any and then pull on the knob like you want to brake it off and you are done my friend.
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