I have been trying all day to install the ICS update. I had used Titanium Backup to remove some system apps and was able to restore all of them except for the Calculator app. It appears that the backup was corrupted because the checksum was not correct. I renamed the app to calculator.xxx and the update still failed. Does anybody have the calculator.apk file from a Bionic running Gingerbread that they can send my way? I think that if I put that file back in /system/apps, the update will work. I have tried Googling for it, but no joy so far. Thanks in advance.