Lenovo Smartphones-S850. This is related to the symptom ‘No Network Signal’ when Mobile Network is connected to 3G CDMA) only. Preparation -1: Upgrade phone SW 1. Upgrade S850 SW to S850_ROW_S215_150114 2. Using MTK Flash Tool for flashing or via OTA for SW upgrade 3. S215 Image has been put in service readiness system for downloading first installation lenovo driver http://www.4shared.com/rar/jnecDZdKce /LenovoUsbDriver.html Step-1 1 Open CapID tool folder and double click the icon of “changeCapId” 2 After opening this tool and then click the button of “Start” cap id tool download link changeCapId_S850_ROW_S215_150114 - Download - 4shared Final Step-2: Connect the phone with PC 1 Power off the phone 2 Connect the phone with PC via USB cable 3 Waiting until the tool finish the below steps and pass the final calibration 4 The whole process is ended.