thank you for your answer.
I will tried to let the phone alone during 15-20 min as you say, but in fact it's strange, because with the phone that works (W10 and a new K750), it pairs immediatly...with the not working phones, the phones reboot themselves...
But i think that i have found the main pb. I just go to the car seller, and i've tried my phone with a another car, and same problem, my phone freezes.
I reaaly think, that the "old" phone from SE (made in 2006 or before), it doesnt work.
To be more detailed, if the phone has a CID 36 (like the BIOS of the phone), its doesn't work, but if the phone has a CID 49 it's OK!
And there is no link with the firmware, because i've tried with all firwmares, (R1BC002, R1DB001, R1BD001....) and that's not ok.
As the K750 could be CID 36 (old) or CID49 (new), that's why, i guess, some K750 works and others not...
As you could see, i became a expert !! But it still doesn't work !!!:bang:
Bouhouhou, i'm so sad, because my car is so cool and great....
I'm afraid that i must buy an other phone, even if i like my phone (W800)...