How Can I restore LG TV's firmware to default?

How Can I restore LG TV's firmware to default?

I have an LG 47LV5400, one of the LG 2011 models with Medialink and "Plex Client integration. This worked quite fine until I installed an update. Now my TV is unable to find the Plex server.

ANSWERS:

Yes, I managed. Look at LG downgrade 2012-2013

Hello