Magnavox 50MV349R Owner's Manual page 59

7
On the 6-digit code page, write down the 6-digit code that
appears, and then take it back to your TV.
12- and 6-digit codes
The USB update process uses a pair of codes to validate that
you are authorized to install an update, and to ensure you are
not attempting to install an old, unsupported version of the
system software.
8
Using the TV remote, select Next to move to the next screen,
and then use the on-screen keyboard to enter the 6-digit code.
When finished, select OK. The system update begins. Do not
remove the USB flash drive until the TV restarts.
When the update finishes, the TV restarts. You can check the new
version number by navigating to Settings > System > About.
59 .
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