You should disable OTN Support ASAP and block updates on router ASAP
I do NOT support "latest fw" at ALL. If you have one you should block updates on router and wait for it to STOP being "latest":) If you want me to help you please paste FULL log(s) to "spoiler"/"code" bbcodes or provide link(s) to pasted file(s) on https://pastebin.com Otherwise "NO HELP"!!!If you want root DISABLE internet access to your device!!!!DO NOT EVER INSTALL FIRMWARE UPGRADE !!!!
English is not my native language.
48H6500 (T-MST14DEUC_2606 -> 2130)
22H5610 (T-MST14DEUC_1106.1) Both rooted by mihd method
55HU8590 -> rooted by network, did someone root it by Skype ?
Unzip the firmware 0000.0 to your Fat32 formatted USB and then plug in to TV maybe TV off can help. Wait a while and enter menu and try update your TV it should appear update from USB.