Kindle OS is not a PC OS. Normally there is no other programs and tools installed (excluding hacks/jailbreaks) so Amazon could easily guarantee no problems with updates. On PC there are a thousands of programs and tools with all their incompatibility issues.
My Kindle 2 Intl 3G was not updated automatically from 2.5.2 to 2.5.4 (I am talking about 10 oct 2010) so I had to update it manually from the Kindle's support page in the Amazon site. And 2.5.4 was not beta but was not pushed automatically to my Kindle.
As for a rollback - yes, only hacks/jailbreaks do have a rollback (uninstall) provided. Amazon does not like the rollbacks (but I think if your Kindle is still under warranty they will send you a replacement one ASAP).
Last edited by enkov; 01-01-2011 at 01:35 PM.
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