Download the .rar file and extract the contents. You should see a file typically named allupgrade_ms3458_sos.bin (or similar).

Once the progress bar reaches 100% or the LED stops flashing, the TV will reboot. Unplug the USB drive. Download Link

Below is a template for a forum or blog post designed to help others find or share this specific 4K firmware package.

Press and hold the on the TV panel (not the remote). While holding the button, plug the power cord back in.

Searching for specific firmware files like for the Cobia CLEDTV5517UHD usually leads to specialized technician forums or hardware databases.

Do you have the (found on a sticker inside the TV) to ensure this version is a perfect match for your hardware?

MS3458_U801_3840x2160_Cobia_CLEDTV5517UHD.rar Resolution: 3840 x 2160 (4K UHD) Mainboard: MS3458-U801 Description

Flashing the wrong firmware can permanently brick your television. Always verify that your Mainboard Model (MS3458-U801) and Panel Number match the file exactly before proceeding.