Problem installing update package

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http://androidforums.com – The problem I'm experiencing with my HTC hero is that I'm unable to install any of the android system updates. As soon as I've downloaded the update package and commenced the installation I receive this message at the "Android system recovery" menu: Build: RA-hero-v1.6.2 Finding update package...Opening update package...Veryfying update package... E: No signature (235 files) E: Verification failed Installation aborted. Any one have any idea what the cause of this may be? (General)