Sim900a mini network problem

Hello everybody,

I purchased a sim900a mini v3.8.2 module for use in a project with Arduino Uno, but encountered the Unable to connect to network error. (i’m from Tunisia)
I then tried to reflash the module as indicated in some blogs on google but the flashing software hangs at 0% or it should normally start after I unplug the brown wire (RESET):

Any one have seen this problem ?

Hello again,

I have found a solution for that problem but i have got another error:

i am connecting the module to the computer via a TTL to usb converter.