Sony continues to show us how much love they have for hacking and tinkering by releasing Emma, a new flash tool for Xperia devices with unlocked bootloaders. It’s in beta, and it gives users the ability to revert back to Sony stock ROMs. For starters, it’s only available on the Xperia S, Xperia arc, and Xperia arc S, but more handsets will be added soon. You can download the software from their developer site and check out the video to see how easy it is.
source: Sony development