Cyanogenmod no service? I had cm-11-20150517-NIGHTLY working, then upgraded to cm-11-20150607-NIGHTLY. Now I get the error "No service" and have basically no GSM functionality whatsoever.

If I attempt to select a network operator, I get the error: "Error while searching for networks."

I installed this using TWRP, there were no issues with the install. Automatic upgrade failed, I believe this is due to an encrypted file system, something which TWRP does not handle.

What I have tried:

Rebooting by itself.

Removing the USB cable and rebooting (apparently this was a known issue before).

Reverting to cm-11-20150517-NIGHTLY, this does nothing, same problem.

Resetting APNs to default.

Device: GT-N7100,
CyanogenMod version: 11-20150517-NIGHTLY-n7100,
Android version: 4.4.4
Solution was to restore a backup of /efs and write a backup of the modem firmware to /dev/block/mmcblk0p10, this device file may be different on a different deivce though. But on my N7100 it worked.