As the subject suggests... 8.1.2 bricked my phone. I have no idea as to why this happened. And no matter what I tried, error 4013 and error 9 kept popping up. However, I managed to get access to a second MBP. Where lo and behold it went through OK... So, word of warning... It might just catch you out like it did me... backup so that you can restore if you need to... Stupid me didn't, but I didn't lose much... As I don't use my phone as a storage device. The only thing lost was time, due to setting the phone up from default.