@remolaan If your box has the s805x cpu (not s805 as your title indicates), you might have success following these instructions: https://forum.armbian.com/topic/17106-installation-instructions-for-tv-boxes-with-amlogic-cpus
Using the meson-gxl-s805x-p241.dtb or meson-gxl-s805x-libretech-ac.dtb
and the u-boot-s905x-s912 uboot file
I'm not aware on anyone having ever tried this, but it might work.