If you really want "up to date" (which i understand you mean new apps and games) then why not buy a new phone like galaxy s4/3 or any mid or high range android phone? since the big bottleneck here is n900's hardware not maemo 5 , and no you cannot use android 4.2 on n900, only android 2.3(nitdroid n12umay) is usable, again because of old and limited hardware.