To make it really simple all you should need to do is unroot (use Voodoo OTA RootKeeper app for temp unroot) and make sure you have changed your rol.build.description line in build.prop to be like sgs2 on 2.3.7 and it should work for you.
This needs to be documented properly as I dont think this is working.... well Ive tried this as well and it failed. :/
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