I think it’s because the firmware on your screen is too old to update using the method I told you about.
Please try the following method.
(1) Create \STONE\bin and bin folder to store the firmware stoneHMI (named fixed), as follows.
(2) In the power-on state, the K600 dipswitch on the motherboard switch to the host side, as follows.
(3) insert the prepared U-disk for a while, the LED next to the reset button will have a blue light flashing.
(4) and wait 5-10s after the end of the LED flashing, send the restart command in the serial port, the device reboot while unplugging the U-disk. (If there is no serial port connected, you can use the reset button. But please try to use the restart method of sending commands in the serial port.).
Please change the name of the firmware I sent you to stoneHMI