You need to set new UUID or use device name. Because when both devices are attached then kernel is used from one (boot) device and system could be used from another..
You could set new UUID from LibreELEC to unmounted device with command like
tune2fs /dev/sdXY -U $(uuidgen)On flash partition you need file uEnv.txt, KERNEL, SYSTEM and imx6q-cubox-i.dtb.
I think it is this file according to Zero2Nine user: /var/packages/WebDAVServer/target/etc/httpd/conf/extra/httpd-ssl.conf-cipher
I think you will have to change ciphers on your other 2 synology's.
What about removing volume label LIBREELEC on a created disk?
Own problem, own thread, own debug log please.
No need.
Seems for now only version with 3.14 kernel is not affected with this bug: LibreELEC-imx6.arm-7.95.3-sr-3.14.img.gz
Not yet tested (will do later today): LibreELEC-imx6.arm-7.95.3-sr-3.14.img.gz
This is version 7.95.3 with kernel 3.14 which doesn't have this sound start issue. At least initial tests shows that.
I'm still on 7.95.2. Will try out this and skip 7.95.3 for now since I had 3 fails with different installs.
Don't expect next version to be much better. With one guy touching basic things and the other doing basic testing you can't expect miracles.
7.95.3 had u-boot and kernel bump. Seems some things got broken.
10 steps back. Again... 
If you have "no signal" on tv then you need my version with 3.14 kernel: LibreELEC-imx6.arm-7.95.2-sr-3.14.img.gz
No 7.95.3 yet.
You need to make a proper package libvlc and add it as dependency for some other. Like everything in LE is build.
Then just disable gpio ir receiver
rm -f /storage/.config/modprobe.d/lirc_xbox.conf
echo "blacklist gpio-ir-recv" >> /storage/.config/modprobe.d/disable-gpio-ir-recv.confYou could also disable xbox module loading. Type this in ssh console
echo "blacklist lirc_xbox" >> /storage/.config/modprobe.d/lirc_xbox.confCan someone try to remove EFI folder when LE stick is created? Maybe it would boot then.
Strange.
Maybe LE image is created in a different way... If I understand correctly syslinux is not shown with LE image?
PM Sent
Thanks. Will try to reproduce. But first I will try to fix sound issue.
Yes please: upload zip file with images somewhere.
Seems I missed this thread. How can I reproduce? Is there a problem with specific image or images in general?
I put few images in Pictures folder and I can show them just fine.
I assume the main issue is with syslinux: it is too newer for this systems?