It's the correct dtb to use, but it's hard to comment on what's happening without seeing the output from the debug UART connector on the board; this shows the early (u-boot) boot process that we need to manipulate to boot Linux. Note that you can't just put the SD card in and boot, you need to invoke recovery boot so that u-boot searches for (and finds) bootscripts on the SD card. Also note that you must not rename the dtb file as with legacy kernel images: https://wiki.libreelec.tv/hardware/amlogic
same here, but i have some additional information.
i tried the dtb file from libreelec to boot emuelec - same issue.
i tried the dtb file from emuelec to boot libreelec - now i get am instant black screen.
emuelec is booting and working normal.
EmuELEC images are based on downstream Amlogic vendor kernels (CE not LE) which means device-tree files are not compatible with LE images using mainline kernels.
ah ok... so coreelec is the same i guess?
because coreelec is working also normal on this device.
I've never booted either of them (someone else's problem) so can't really comment 
In case there is still some users of a95x f3 air then current nightly (and probably all) LE version will not boot on it even though there is meson-sm1-a95xf3-air.dtb device tree for this box available. At least from me, I have two of them. But the fix is simple, apply this patch to LE repository:
diff --git a/projects/Amlogic/bootloader/scripts/s905_autoscript.src b/projects/Amlogic/bootloader/scripts/s905_autoscript.src
index 8b83de1748..5f4f45be14 100644
--- a/projects/Amlogic/bootloader/scripts/s905_autoscript.src
+++ b/projects/Amlogic/bootloader/scripts/s905_autoscript.src
@@ -7,5 +7,7 @@ setenv try_boot_start 'if fatload ${devtype} ${devnum} ${loadaddr} KERNEL; then
setenv devtype mmc
setenv devnum 0
run try_boot_start
-setenv devtype usb
-for devnum in 0 1 2 3 ; do run try_boot_start ; done
+bootm start
+bootm loados
+bootm prep
+bootm gomake image amd prepare sd card with it. Now it should boot.
Or use attached compiled s905_autoscript script (replace s905_autoscript on your sd card with it).
background:
on a95x f3, command bootm ${loadaddr} - ${dtb_mem_addr} fails with some signature check failure. But this happens also on CoreElec build that I used from the beginning. So I looked how CoreElec is booting and it uses this procedure from the patch which make the board boot at the end.
