Following are the steps to update or downgrade Samsung firmware.
Copy USB image named such as T-HKMLAKUC in USB root location. Example:
Connect USB to TV
Go To Software Update Screen
Menu -> Support -> Software Update
Select Software Update
Select Update Now
Select Yes
After rebooting, you can check the upgraded was successful by go to Menu -> Support -and hovering over "Software Update". On the right side of the screen the “Current Version” will be list, in the example below it is firmware 2006.
