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Actually, you can update using the jailbreak download.
To get old firmware, you can modify the firmware version in the amazon URL for downloading the latest version. There is no thread about that since it is a bit hard to describe to anyone that doesn't understand the previous sentence.
There are individual posts in long threads that do so. I can search around for one, but it might be a while before I can get to it.
You need to read the wiki page referenced in the first post I linked to and carefully read that entire post. If you read the various recent jailbreak threads you might come across a post explaining how to get old fw versions. After reading the first few posts in each thread, you might have the best luck by reading them backwards from the ends of the threads.
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