If you have a second, working T.v56.03 board with the correct resolution, you can dump its firmware using an SPI programmer (e.g., CH341A) and then flash it to another board.
(Filename: T.v56.03_1366x768_USB_FREE.zip | Size: ~4.2 MB) T.v56.03 Firmware -FREE- Download 1366x768
While there is no single "official" website for the T.V56.03 universal board, firmware for the resolution is widely shared in community-driven electronics repair hubs. This board is popular for converting old laptop screens or fixing budget LED TVs. Download Resources If you have a second, working T
The flashing is complete when the blinking stops, and the light remains a steady color (usually Green ). Do not turn off the power during this process, as it can permanently damage the board . Download Resources The flashing is complete when the
Insert the USB into the T.V56.03 board while it is powered off.