Igor failed 5 times. Can you open the crypt?

Igor scratched his failed attempts on the crypt wall:
666 · "Too obvious," said the door. Nothing is correct.
419 · One digit is correct and in the right place.
048 · One digit is correct but in the wrong place.
836 · One digit is correct but in the wrong place.
649 · Nothing is correct. Igor cried.
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