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How to change your racket during the match legally? Just peel rubber by yourself (watch from 29min 38sec):
also interesting to note that he changed from DHS W968 to some other blade
The glue wasn't strong enough and the rubber peeled off because of the booster. (probably)
He showed it to the umpire, who allowed him to change his racket.
He let the equipment control guys to examine his racket right after the match.
It's legal, just like if you accidentally break your blade during the match.
If you look carefully he tried to peel black rubber first, but couldn't do that fastly, so peeled off red one right after that. If it was already peeled off - why he peeled it more with his hands and didn't showed it to umpire right away. I would guess that he didn't liked his racket and thought that changing it could be his last chance to get back to game. But in my opinion it was not the racket, he was just playing whole game not at his level.