Today I have updated the firmware of my 2009 TV to the latest one available (10/2011).
Unfortunately LG doesn’t support this TV and doesn’t officially provide updates.
Luckily the software which runs on LG 42LH2000 is the very same which runs on the 32” version. Then you can safely upgrade the firmware of your 32” TV with the firmware released for the 42” one that can be found at this page http://www.lg.com/uk/support-product/lg-32LG2000#
PS: No idea yet what kind of improvements comes with this release!