Can't upgrade ipod touch to ios 5 beta 2?

Hi everyone! I recently tried to upgrade my firmware from ios 5 beta 1 to ios 5 beta 2 (I have a developer account, paid the $99 and everything).
The upgrade to beta 1 from 4.3.3 was pretty much flawless. When I tried to upgrade to ios 5 beta 2, it seemed to work until the last step, at which point the ipod touch was off and could not be turned on. When connected to a computer, it said it was stuck in recovery mode. I couldn't switch my firmware in Organizer any more, not even back to beta 1.
I restored down to 4.3.3 again cause I figured it would wipe the whole thing and let me upgrade back to beta 1 at least. That much worked, I have an ipod with 4.3.3 on it.
Now when I try to upgrade back UP to beta 2 or even beta 1 again, I get this error: "Could not allocate buffer (file exists)" and the ipod goes back into recovery mode, and I must again restore down to 4.3.3.
What file is this, how can I delete it, and how can I upgrade again to beta 2? This ought to be the last time I need to upgrade with a wired connection, since all updates from Beta 2 onwards are OTA as far as I know.
I was quite fearful of "bricking", but a friend who is far more familiar with the inner workings of the ipod touch than I am has assured me that since the computer detected it in recovery mode, it wasn't a lost cause.
I was originally attempting the install from a slightly older version of Xcode, which is probably the root cause of this problem and I am now kicking myself.
Thanks for the help!

Please use the confidential forums created for this purpose:
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