How to re-install Calendar.apk
I've just done something stupid.. I wanted to install the old (G1) Calendar app on my Hero (I think the old app is better, faster etc.). So in order to do that I first deleted CalendarProvider.apk (and .odex) and Calendar.apk (and .odex) from /system/app
So after that brilliant step, I found out the old calendar won't install.. and now I found out the original (backuped) apk's won't install either.
I tried adb push to /system/app, which works, but doesn't give me a working calendar.
What to do?