VIM3_Pie_V200319 weird HDMI output

Hi, trying to use my Khadas VIM3 for NPU dev, the stock Android image seemed corrupted so I flashed the latest version found at https://dl.khadas.com/Firmware/VIM3/Android/

However the HDMI output is still weird on a HDMI 7" 1024x600 screen with non standard touch input (non HDI) from WaveShare https://www.waveshare.com/product/displays/lcd-oled/lcd-oled-1/7inch-hdmi-lcd-c.htm (driver for RPi https://github.com/bsteinsbo/rpi_touch_driver)

So the display is scrambled on the VIM3, yet the screen works well on the PC.

snapshot

Any idea ?