hi guys
for flashing the SE C902 here is the steps

1-use the correcte firmware
2- the flash process should be done one by one means that you never use the complet package on one steps
a- flash with MBN file
b- flash with Fbn file
c- flash with customs file
3-remove a battery waite 1mn then put it a gain and press on you will have a message (please waite )about 15mn then the phone restart . and now every thing is ok you can use your phone

aftre 16days looking for a solution for my phone i found this is the best way .

thanks for all