This is rarely a driver problem. Clean the keyboard with compressed air. If it persists, update the firmware via Logitech Options+ (Check for Updates > Firmware Update).
Yes, as of Logitech Options+ version 1.44 and above, native ARM64 support is included. ergo k860 driver download
In the age of the internet, searching for drivers can be dangerous. A quick Google search for "ergo k860 driver download" might lead you to third-party websites that bundle malware or adware with the installation files. This is rarely a driver problem
Yes. The Easy-Switch function pairs the keyboard to 3 devices, but the customization software must be installed on each device for the profiles to work. Firmware Update). Yes