Hello,
I will answer my self to share my experience. Aftere many mails and videos with GearBest Support, the only suggestion that I get is to send it back at my charge to be repared.
I know by experience that sending item to repair is a pain in the ass, to China it should be more !
So i decided to give up with cheap chinese devices and come back to well known ones : Samsung.
My Advice : put 20% more and by a International known device with local warenty and repair service.
Cube and GearBest : Goodbye