How To Disable Firmware updates
For this procedure you have to enter to the Service menu of the TV:
- 1. With TV switched off, press the following sequence on the remote: [INFO] [MENU] [MUTE] [POWER]
- !!!At this point be careful. Values are changeable with Left/Right keys. Moving in the menu is only with Up/Down!!!
- 2. You have to enable the extended service menu. There only 3 possibilities - IR Blaster from the TV  ; or IR device such Nokia or Samsung, or even build a IR transmitter 
- 3. Have to send FACTORY+3SPEED to the TV.
- 4. Then have to locate the OTN Support (Service Menu -> "Control" -> "Sub Option" -> "OTN Support" -> Off) to avoid future firmware updates.
- 5. Power off TV.