I had this exact same issue, as have at least one other person on the Moto/Lenovo forum. The BT radio refuses to turn on, in safe mode, after wiping the cache partition, or after a complete factory reset. Happened immediately after the September udpate. I suspect an update software issue. I received a replacement phone from Verizon, installed all of my previous apps from backup and then successfully applied both the July and September updates. Since this has not happened to everyone, it may be connected to some custom issue. On my previous phone, I renamed my device name on Bluetooth. I did not do that for my replacement. It is possible that changing the BT device string caused the update to bork. It's a hypothesis anyway. Anyone experiencing this problem rename their device?