You can also dirty flash it as first try. I moved from PE 12 to PE 13 with no issues. An than only if you have the same problem clean flash.I am on PE 12.1 from almost Day 1 of its release. The past couple of days I have been getting no signal on both of my SIM cards. That happens randomly and the only temporary fix I have is just switching on and off airplane mode. I will probably clean flash the newer version but for the time being I have not the time,so I am looking for a fix other than airplane mode. Did it happen anyone else or is it