I'm looking at logs for EAUpdaterService to see why my new pair of AirPods Max will not update from firmware 3C16.
I see that the firmware is being recognized as out of date, and the new version is being downloaded. It appears that, in the process of starting the actual update, the connection is invalidated, and I'm not sure why, or what to do about it:
EAUpdaterService error = Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.commcenter.coretelephony.xpc was invalidated: failed at lookup with error 159 - Sandbox restriction." UserInfo={NSDebugDescription=The connection to service named com.apple.commcenter.coretelephony.xpc was invalidated: failed at lookup with error 159 - Sandbox restriction.}