Question [Q] [ROM PORTING] Problem with GPS

Hello,

I've ported a ROM based on the MT6582 processor
The original owns this processor too

Everything works correctly except the GPS, I can activate it but it is unable to find any satellites. The icon appears on the task bar and is blinking, that"'s all

I've tried several thing : GPS doctor, create a new gps.conf, download the last EPO file without success

Any idea ?
Actually : iOcean X7HD