I'll try to be clearer. I need to change my IMEI why after some changes in the ROM I lost. Getting "null". so I started to investigate some methods to change IMEI. A tool called QSPT NVs Manager would promise to do this, but errors occur. Another tool is the EFS Professional with Qualcomm platform Tolls. But in this latter case it is necessary to send the "SPC-Service Product Code" with six digits before everything, but the program crashes. Like an authentication to change data in the chipset. But it does not have the "SPC". And my IMEI remains NULL, and my cell no signal.