Read here : A2-DB3150 Flashing
download a2uploader and follow this procedure
1. Remove batt, and replace it again
2. Click "Identify" on A2uploader app.
3. Now while pressing and holding "C" button or 2+5 untill the computer detects the SEMC driver
4. now you'll see some information on the left window of A2uploader.
5. Copy and paste the information here