Hello Dear all,
I would like to share this with you ,
I finaly resolved the problem of the boot on the phone , the solution was the following:
-Donwloaded DERT version : DERT_V1R0.0.0_HFA_3_0.16.0
-Plug-in the power adapter into the phone + RJ45 cable
-In the same time while you're pluging tha power adapter, press the numbre 3 on the phone and keep pressing , till a message will appear on the phone's screen telling you that the downloading is begin
-After finishing you should be able to see theb message : "PHONE IS STARTING ".
(PS: i did that with my responsibility , it could goes wrong , but thank to allah)
I hope I make this clear to you too.
Thank you all for your collaboration .
Regards .