I just want to report that LibreELEC-ARMv7.arm-9.80-devel-20210117165740-d174eba-rk3188.img.gz is partially working on minix neo x7. There are problems with network connections (no wifi and no ethernet interface) and other little things to adjust ( eg. reboot is not working properly), but audio and video are working fine (I couldn't test everything properly because of the size of my sd card, but I plan to connect an hard disk this weekend and make more tests). Let me know if I can be of any help in this project.
Thank you