Hi there,
I hope I can get an answer here, looks very calm here last few month.
I got an Slice Barbone with a CM3+ from a friend, running LibreElec 9.2.8 on it.
I read the most posts here, but I am not so used to all of the slice things.
So my question: Is it possible to get the Slice updated to LE11 with the LED features?
Thanks in advance and sorry for my in ability 
The Slice add-on that managed the LED ring in the background is Python2 based and wasn't migrated/updated to Python3 which is needed for compatibility with LE11. You can cross-grade/update the main OS to LE11 by switching to the RPi2 image, but the LED functions will stop in the process. Cross-grading requires you to SSH in and download the RPi2 image to /storage/.update and "touch /storage/.update/.nocompat" to override the compat check which will detect a non-Slice image and abort the update process.
The Slice add-on that managed the LED ring in the background is Python2 based and wasn't migrated/updated to Python3 which is needed for compatibility with LE11. You can cross-grade/update the main OS to LE11 by switching to the RPi2 image, but the LED functions will stop in the process. Cross-grading requires you to SSH in and download the RPi2 image to /storage/.update and "touch /storage/.update/.nocompat" to override the compat check which will detect a non-Slice image and abort the update process.
So I was thinking about that LED strip on the Slice and how it actually works, but there's probably no way to integrate the LED's into my Slice NAS project I assume?
https://github.com/LibreELEC/LibreELEC.tv/pull/4566 <= That's the PR that dropped support for Slice boxes. In there you'll find the original add-on that FiveNinjas created and LE buildsystem package.mk files that tell you where the drivers are. Compile the drivers for your OS and then use the add-on (or use it for inspiration on how to control the LEDs). The only barriers to doing things are time and effort.
