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I'm not sure what will happen if the power goes down during upgrade, but I guess the TV will not work. Therefore I haven't notice that the TV has some sort of Bios or something similar but for sure is not erasing the old OS before fully install the new one. BTW I forgot to mention in my previous post that you can check the status of the update in the menu while updating.

I have one Question for this steps , If the TV starting the update and the Power is Down what well happen ?? can i start upgrade again Or TV will now Power On again ??

In my post the details i have provided are for TV model 42LB625T, be careful choosing the right firmware! As Jimbo1876 explain in his post the procedure how to upgrade firm from USB is very well explained on LG website. 1. Download the archive file. 2. Unzip 3. Create folder on the USB drive and name it "LG_DTV" 4. Copy the file/s to USB drive in the previously created folder "LG_DTV". 5. Turn off the TV from remote 6. Plug in any of the USB ports or in service USB if it's exist. 7. Turn the TV on. 8. When "USB connected" message will apire select from the dialog "stay". 9. Last "USB update" message will apire chose "install". What for around 10-15 minutes and than restart the TV. Please note that I don't take any responsibility if something goes wrong while updating the firmware. Regards,

Then why on earth do they give instructions on how to do it via USB? I have used USB method on last 3 updates with no issues whatsoever. It is entirely up to yourself if you choose that option.

There are explicit details of how to update via USB on the LG site for your TV