Quick background- I had installed cm10 on my phone and noticed some things werent right such as my keyboard kept crashing...nothing requiring data would work...my "home" key wouldnt work etc etc. so i decided I wanted to flash back to the stock ROM so I could maybe start over. I first attempted using Odin. I went through all the steps and while uploading the factory.fs file the screen would go blank (the download screen would disappear leaving a lit-but blank screen)-odin would stop responding and eventually tell me the flash had failed. so I tried all the troubleshooting tips including attempting without a battery, without the SD card etc etc only to get the same result. So I turned to Heimdall. Basically the same thing happened. I selected all the correct files and put them in the correct places and 14% through uploading the factoryfs it went to a blank screen and failed. so i tried again and again and get the same result every time. what on earth could i be doing wrong?