I am answering only because I don't want you to feel no one did, but I have no solution. Disassembly of that pistol requires pulling the slide back and locking the recoil spring. I don't know what to do if the slide won't come back. FWIW, it sounds like the recoil spring has become jammed up, probably due to trying to take the pistol down the wrong way.
Maybe, and note that word, you can still lower the takedown latch and get the stop lug down out of the way. If so, then maybe you can pull the slide off to the rear, but I wouldn't count on it.
Jim
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