But I can’t find “Anthias for pi400” from Raspberry Pi Imager. So I just downloaded “Anthias for pi4” but only showed Anthias Logo with a purple background and nothing worked. (ctrl + alt + f1 is not works too)
I’ve had trouble on a Raspberry Pi 3b+ using the recent images and install script with the CTRL+ALT+F1 functionality. That said, if you’ve gotten to the purple Anthias image, did you try accessing the device’s web interface remotely? Once setup, the device isn’t intended to be directly interacted with, it is essentially a standalone kiosk slideshow. You’d want to access the device over the network (ex: http://raspberrypi.local) to access its web interface and add some assets (slides) for it to then display, well…anything.
Do note that after adding, you need to also activate your assets.