Camera+Power drops me (on both phones, locked and unlocked) with with an open usb port declared as Windows Phone, and with a picture of a phone and a laptop on lumia's screen
I dont kniw if thats for zune updates but it seems so.
When I get back home Ill try to capture usb traffic from connection and firmware upgrade in NCS. If it can change the bootloader from windows phone, or it can reboot to some ram address it's worth checking out...will report with what I find.
Sent from my GT-I9100 using XDA