Did you use the Nokia Software Updater? Or did you flash the phone yourself? As I understand it you at one point had access. After upgrading you no longer have access. If you flashed the phone from command line make sure you use the right firmware. If you only used the NSU then you might have to flash the eMMC and the firmware to the phone. You need the Vanilla eMMC package and the latest firmware. Maybe you installed a package from extra-devels you weren't supposed to? I had issues with my phone after updating with the NSU but after I flashed it from the command line interface the phone worked extremely better.