htc m9 unlock bootloader without losing Data?

Xtc2clip team
And all user.s

I hope every bady are fine
About me im very happy to buy this prod tool:p
Its very good for our job
I tried before to s-off my m9 without any problem even withot any los Data
Now we hope to know how to unlock bootloader for downloadmode device like m9 m9 plus i mean new modell without losing Data
I hope xtc2clip team support to explan for us how to that

Thanx advance