When trying to upgrade to ios5, i got the following message

The following install step failed: run preupgrade script for AppleMobileDeviceSupport. Contact the software manufacturer for assistance.

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Mountain Lion is a 64-bit operating system, and an Intel Core Duo processor is only 32-bit, so you can't use Mountain Lion on your Mac. You can keep using your actual OS X version or buy a new Mac if you want Mountain Lion

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