Ensure your TV is indeed the 3840x2160 (4K) version. Installing 2K firmware on a 4K panel can result in a "No Display" or "Upside Down" screen.
You must download every single part in the sequence (usually Parts 01 through 07). Download HV553 3840x2160 part07 rar
Wait for the process to hit 100%. Do not turn off the power. Once finished, the TV will usually reboot or go into standby. Common Troubleshooting Ensure your TV is indeed the 3840x2160 (4K) version
Multi-part archives (Part 01, Part 02... Part 07) work as a single unit. You cannot extract on its own. To successfully access the firmware: Download HV553 3840x2160 part07 rar
How to Download and Install HV553 3840x2160 Part 07 Firmware