the cpu is intel celeron N2940
Tthe cpu is not that old and its know to work with LE.
You could try to add the command like described at RE: Xandr Replacement
You need a working ssh connection to the laptop or you boot some Ubuntu Live and then edit at the files at the storage.
https://wiki.libreelec.tv/configuration/edid#editing-the-extlinux.conf-or-syslinux.cfg