bgg456

Hi, I have a LG 43UF680V TV (HE_DTV_W15A_AFADABAA) with 04.20.70 firmware (in France). When I watch "Fransat UltraHD channel", the only 4K channel on Eutelsat 5W, I have this problem : UltraHD is a 30 mn loop of "5mn demo sequences". On one sequence, the picture freeze several times exactly at the same moments. But when if I record this 4K sequence on the USB drive connected to the TV, there is no problem when I read the sequence. Any idea ? May I downgrade to 04.20.50 firmware? Best regards