If there is no signal on your phone, it maybe Caused by IMEI or NV lost. You april check the IMEI Firstly, input * # 06 #, if the IMEI is lost or invalid, you have to re-write the IMEI. And you a small check NV to input * # 66 #, and press "SN", to see if NV is there, if it is blank That means you have to re-write the NV as well. (IMEI and NV maybe lost because of flashing ROM or factory reset)
maybe you should rewrite the NV
When the write NV, please ensure code That the version corresponds to your phone model.
Write NV tool (including guidance)
give it a try.
Can somebody help me how to do it exactly?