I am begging for help with this problem. I was trying to fix the "invalid ipa file" issue by uninstalling both installous and appsync. I made mistake of uninstalling appsync first and then installous. Now the iphone just hangs at the apple screen and the spinning icon eventually just stops spinning. I tried following another thread that talked about fixing this issue but it didnt help (installed and ran Cygwin but i couldnt get into the phone that way. I kept getting msg that said connection refused. Perhaps I am doing something wrong, quite possible, but I followed this thread http://forums.macrumors.com/showthread.php?t=1095080 I tried going into DFU mode but that did nothing. Right now the phone sits at the apple screen and eventually turns off and then back on by itself, only to hang at the same place. If I do a restore will I lose everything in iTunes? Any help is greatly appreciated.