Ive been running Cyanogenmod for over a year and regularly upgrade but the recent move to CM11 0715 Nightly corrupted my EFS folder and I lost my modem, IMEI, APN's etc. Of course, no EFS backup (know better now!) blah blah. The only way I could restore the modem was to install I9505XXUGNE5_I9505VNZGNF2_I9505XXUGNE5_HOME.tar which is 4.4.2. Modem back but could not turn on WiFi and no sound. Flashed CM11 M7 and modem and WiFi working but still no sound.
Have reinstated stock 4.2.2 now and oddly, there is no sign of Know in the recovery screen.
Have read that ticking 'Auto Reboot' in ODIN causes the modem install to fail and that causes these issues but I've tried that too without joy. Apparently the correct modem needs to be restored to fix the sound but I'm not sure where to go now.
Any assistance would be greatly appreciated before I end up with a divorce!