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The official Amazon firmware checks that files on the Kindle haven't been modified.
Hacks such as the screensaver or the UFH hack modify some files; and as such the official firmware update will fail until they are removed. So, if your Kindle 2 has not updated to 2.5 and you want to prevent such updates just install one of the hacks, for example the screensaver <https://wiki.mobileread.com/wiki/Kindle_2_US,_Int%27l_and_Kindle_DX_Screen_Saver_Ha ck>
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