Howdy every one,       I upgrade the UM2 firmware to Marlin 1.1.x version, so I could have access to BLtouch and some other extra features. The printer is working fine except for two things:   The Hotend auto fan will not work, no matter what I do. (same issue as here : ) The controller leds behind the nob will not turn on. Is there anyone who have a fully working UM2 with BLtouch able to share the firmware files or help? Thank you in advance,