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This would surprise everyone.
Bringing a series to six games would be extremely hard to accomplish, especially if they play the Miami Heat, in which case this has a slim-to0none chance of happening. But if it did, the Sixers would need to do a few things.
For one, they would need to put the inconsistent regular season behind them and be completely focused on winning now. Secondly, they would need to execute everything and win the game defensively.
Basically, everything would have to go their way and they'd have to play to the best of their abilities. It's not likely, but hey, it could happen and it's something very bold to go out on.