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Root Rooted FRF83 issues

Very noob brand new Android and Nexus One user here.

I just bought a rooted Nexus One with a FRF83 build preinstalled.
It's been working great but I keep getting messages about installing OTA updates but they always fail (says E: No signature (575 files) E: Verification Failed)
I tried manually downloading the FRF85 and FRF91 update, copying as update.zip to my SD updating from the recovery menu but it still gives the same error.
From the little info I've found online it may be an issue with the ROM but I can't tell for sure.
My ultimate goal would be to go back to stock Android with the latest official Froyo build.

Any help for this brand new and otherwise happy new Android/Nexus One user would be eternally apprechiated! :))
 

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