Strange in general problem. People erased IMEI now can not raise them. There are two such devices with a similar problem.I do this ... on the firmware vince_global_images_8.4.24_20180424.0000.00_7.1 below did not find.Stehr EFS-Recorded Backup QCN
The modem is in place, IMEI also displays, but the phone still shows no SIM card. In the process of experimenting, sometimes it is possible to raise the network and the TA even calls and normally the network catches. I do a TA reboot during the reboot process, it rebooted itself twice twice and turned on without a network and wrote no SIM card. Or simply lie down included with the inserted SIM card and after a while also writes no card.
I don't know what to do yet. EFS falls off after recovery and how to insert a SIM card. Who met and defeated this problem?