If u look a little in this forum u will find it.
I posted it in a topic called with that name.
I am not glad to tell u that 2.1 wont fix error 1011.
I ieraser my iphone in 2.1 and restored to 2.1 and
same error 1012. (in iTunes 8.0 / 1011 in iTunes 7.)
So bad luck for me.