Hi!
When you updated Ableton, the MIDI remote scripts folder probably reset to the default scripts.
Try reinstalling the script as Mateo showed you here:
You don’t need to upgrade the firmware for this, but if you have an old firmware and you want to update, you have to make sure that no other software is getting hold of the USB port, and that the Firmware manager gets to reboot the controller to its “KilomuxBOOT” state, load the firmware file, and then send it to the controller.
Let me know if reinstalling the script works!