I understand, there is no worth to change my F6400 to F6300 (for ex.)...I studied on ebay the mainboard from f6400 and f6500...on some submodel it is really loked the same.
On german forum writes about f6470 to f6640 ....that's why i think that it could work on my tv also(f6400 to f6600). Anyway i also found this on russian forum that you indicated:
"Today finally figured out how to UE22F5400AK (well, and other TV series F) to extend the smart application of the older model. Just through the service menu translated his model UF7200: press on the remote INFO-MENU-MUTE-POWER. Next:
Option-SW MODEL. Choose model arrows left and right. Turn off the TV find UF7200. On again cherished by a combination of three keys.
If image crumbles and rattles, do the following:
Option-Option-MRT Lvds Format. And adjusting the keys left and right, until the image is normal. Turn off the TV. Turn in normal mode and go to Smart Hub. Voila! Ship dates of application. After downloading I think to revert to its model. because suspect. that the processor in this model may be weak. Although this is purely amateurish opinion."