Upgrading Nexus 5 from CyanogenMod 11 to 12.1

  1. On the phone, perform a Nandroid backup from ROM Manager
  2. Under Settings > Developer options, enable Android debugging
  3. Connect the phone via USB to your computer
  4. On your computer, run adb pull /mnt/shell/emulated/clockworkmod/backup
  5. On the phone, turn off Android debugging
  6. Under settings > About Phone > CyanogenMod Updates, download the update and install it