@netway
hi, sorry for the english answer but my deutsch is bad

the driver to use is hyperpixel4 (and not hyperpixel)

have a look on :
https://github.com/pimoroni/hyperpixel4

how to :

compile hyperpixel4.dts (if you have raspbian) or search hyperpixel4.dtbo on the web copy hyperpixel4.dtbo to boot/overlays/ on recalbox add at the bottom of config.txt file : # HyperPixel LCD Settings dtoverlay=hyperpixel4 overscan_left=0 overscan_right=0 overscan_top=0 overscan_bottom=0 framebuffer_width=800 framebuffer_height=480 enable_dpi_lcd=1 display_default_lcd=1 dpi_group=2 dpi_mode=87 dpi_output_format=0x7f216 display_rotate=3 hdmi_timings=480 0 10 16 59 800 0 15 113 15 0 0 0 60 0 32000000 6 copy the hyperpixel4-init who is in /dist directory of github link to /usr/bin/ of recalbox at least, you must execute hyperpixel4-init to initialize the screen at recalbox startup, for example you can add the hyperpixel4-init command at the top of /etc/init.d/S02splash or create a S02hyperpixel script with this command inside

you must remount the recalbox system with rw access to do the 2 last items

reboot and enjoy !

the french thread is here :
https://forum.recalbox.com/topic/17854/ecran-hyperpixel-4-pouces