The firmware update is back again in version 2.1. And there is also an official Panasonic apologizes text:
“We’d like to apologize for the inconvenience as the download had been suspended in order to make sure the reliability of the firmware, more specifically in case of the use of some newly added functions in Ver.2.0 on Custom shooting mode.
Please download the newly released firmware, which has now become available as Ver.2.1.
< For the users who have already updated LX3 to Ver.2.0 >
The camera which has been already updated to Ver.2.0, is also advised to update again to Ver.2.1, as which is now available on this page.”
Download the firmware here: http://panasonic.jp/support/global/cs/dsc/download/LX3/index.html