and longtime manager Scooter Braun claims he had nothing to do with Biebers turnaround.

Ill be frank, Braun said.

I failed for a year and a half.

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He shut himself off and went into a dark place.

Every single day I tried to help him turn it around, and every single day I failed.

And I tried desperately.

The only person who deserves credit for this is Justin.

I couldnt go to sleep during that time, he continued.

Every night I was wondering, Is something going to happen?

I turned to my own dad and asked, What do I do here?

He said, You just got to be a rock.'

It makes you real, rather than, Lets call up Max Martin to write you a hit song.

I want my music to be inspiring.

Like Kylie [Jenner].

Look at her world: She has been living on TV since she was a kid.

Its because its fed, bro, this lifestyle.

Read more on Bieber over atBillboard,and hearPurposewhen it arrives Nov. 13.