HI folks! I tried to root my GT-i9502 this afternoon to get access to Google Play. HOWEVER, When I followed the instructions online (they are much of a muchness http://marrkdaviid.com/2013/07/how-...samsung-galaxy-s4-duos-gt-i9502/#.UjTW8MafgjY ), I am stucked in the first step --- root with odin307. When I went to download mode, open Odin, chose the right package, then linked my smartphone with my laptop, everything went fine, it was correctly connected. However, when I clicked 'Start", the result was failed. Then the screen showed that 'Firmware upgrade encountered an issue. Please select recovery mode in Kies & try again'. I tried to connect to Kies, nevertheless, the computer failed to recognise my smartphone. When I tried Odin for several times, all results were disappointing -- all of them were FAILED! Currently I can enter the download mode, but cannot open my smartphone. Anyone helps!!!!! Thank you VERY MUCH!!