Call ends immediately

[kendepepi]

Hi,

I have a Zopo ZP920 smartphone. A lot of official ROMs are available for this, but only one of them is working fine. All the other ones has a serious issue with calling: when I start a call, it immediately is getting dropped and the phone says: "Call ended." There are several discussions about it everywhere with a wide veriety of solutions (which means the problem is not that simple), but my question is: how can this issue depend on the ROM? What could by the underlying problem which block the call? SMS and mobile data are working fine, only the calls are blocked.

Thanks!

 

[belodion]

I remember considering installing a particular ROM, for a Motorola phone if I recall right, until I noticed when reading the details that WiFi would not work with it.

 

[kendepepi]

In the meantime it has been fixed by the help of a video. In the Engineering mode I had to reset the IMEI number.

Thanks!