Greetings and Thank you for writing to Toradex Community.
The image you are looking for can be found under: Downloads & Installers | Toradex Developer Center. Could you please tell me as to from where in the developer article you got that link to list of images?
I have flashed the image Colibri iMX6ULL (3.0.4 | 2020-04-21 | 52.39 MB) but i cant see spidev0.0 under /dev directory. Do I have to change something inimx6ull-colibri-aster.dtsi file?
In the upacked directory I have deleted all .dtb files exept colibri-imx6ull-aster.dtb and in the image.json file i have replaced all …-eval-v3.dtb with …aster.dtb. Then after installing the image I can see the spidev0.0 under /dev directory.