Now I see you are trying to update with an S805 (m8b) image, even though you have an S905 (gxbb) device. This is not going to be good.
If you update your S905 with the HD18Q image, it is guaranteed to never boot again after you restart your device.
And chewitt is also right, because in Leia versions (9.0/9.2) for Amlogic S905x the kernel is 64-bit, but Kodi is only 32-bit.
I think you need to look for another sd card and create a clean install with this image: LibreELEC-MXQ-4K-Pro_2G.arm-9.2.8.3.img.gz.
This is the correct dtb for your device: gxbb_p200_1G_mxq_pro_4k.dtb, it should be renamed to dtb.img and overwrite the original.