I updated my 49SJ800V TV's firmware from 04.70.95 to 05.80.15 and my smart remote controller not working properly. I can't use cursor and back button also i have connection problem with LAN and WLAN. I use my tv with cable connection but every 15 minutes LAN disconnecting and try to connect again. I resetted my tv to factory settings but result is same. I can't use my tv now normally. how can i downgrade my tv's to last working firmware. I couldn' t find old firmware. Could you help me to downgrade my tv' s FW ?