The string "hktrt2843p639" likely falls into one of the following categories:
If the image is distorted after an update, you may need to enter the service menu (often by pressing Menu + 1147 or Source + 2580 ) to change the panel type or LVDS map. How to Find and Install the New Firmware hktrt2843p639 firmware new
The anti-rollback fuse cannot be reversed. If your new firmware burn-in was successful for >48 hours, downgrading is strongly discouraged. The string "hktrt2843p639" likely falls into one of