Need help with ICS update

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http://forum.xda-developers.com – Hello guys! Not long time ago I received a message that it's time to update my RAZR (rooted XT910). I downloaded it & tried to update, but recieved an "Error 7". I looked in log & found that the error arises from the fact that once I deleted some retarded sys app - HotspotLauncher. After a long walk on the internet, I found the right HotspotLauncher.apk, which checksum is the same as required for update, and put it in the system/app/. Once again tried to update, but again recieved "Error 7". Now the update has stalled because of a file HotspotLauncher.odex. I tried (HowTos)