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Firmware : 04.00.30 TV Model : 40LF6350-SB Country : Brazil

I have been running 5.00.55 for two days now and all audio issues with ARC are fixed. this is tested on a 60LB7500.

It may sound stupid but check that your time is correctly set , I had an issue similar to this and found that it was due to having a different time zone set . Good luck

Hello smx, Ricardo, hey mtuna10 and the guy. And yeah, welcome to LG DUMB TV CLUB, smx. Nice to see you here, and I hope that you find some time to support our colleagues in the struggle with Korean space technology. @mtuna, of course please let me know when you make your TV a little smarter. @Ricardo, this tool can be used to downgrade TVs LA620 - LA741, so you can try to downgrade your 47LA6900 TV. Just try and let me know. If you need more help, we will be here to give it to you. BTW What's your location?