Press and hold the on the TV panel (not the remote). While holding the button, plug the power cord back in.
Use a 4GB or 8GB USB drive and format it to FAT32 . Download MS3458 U801 3840x2160 Cobia CLEDTV5517UHD rar
Once the progress bar reaches 100% or the LED stops flashing, the TV will reboot. Unplug the USB drive. Download Link Press and hold the on the TV panel (not the remote)
Searching for specific firmware files like for the Cobia CLEDTV5517UHD usually leads to specialized technician forums or hardware databases. Download MS3458 U801 3840x2160 Cobia CLEDTV5517UHD rar