The CV59SH-U32 is a cost-effective board, but it is notorious for having no manufacturer safety net. Unlike a Windows update, a failed monitor firmware flash turns the screen into a paperweight unless you have a hardware programmer (like a CH341A).
Most Cv59sh-u32 devices require a hardware short to enter flashing mode: Cv59sh-u32 Software Download
Insert the USB into the TV's USB port while the power is off. The CV59SH-U32 is a cost-effective board, but it
If you have confirmed you need to flash the firmware, here is the general process (varies by manufacturer): The CV59SH-U32 is a cost-effective board