[SOLUTION] Fix for 4.3: unable to power on WiFi and/or Bluetooth
I update my Samsung Galaxy Note 2 to Android 4.3. Sometimes the WiFi goes off without reason and it was not possible to switch on WiFi or Bluetooth. I found that this was caused by two of my Bluetooth devices. I had to go outside out of range of Bluetooth devices and then switch Bluetooth on and then delete pairing I had in the phone (since previous Android 4.1.2 version). Hope it helps somebody as I'm not alone as I saw when digging through Internet forums.
BTW: WiFi & Bluetooth share the same chip, so it seems like a bug in Bluetooth kernel driver or library that manage Bluetooth connections. THERE IS NO NEED TO FLASH ANYTHING!