Quote:
Originally Posted by JSWolf
You should NEVER updated OS X to a new version until you are sure all the hardware & software you need to work works. I've read many reports of USB devices breaking after an OS X update as well as plenty of software that needs to be updated to work.
That's why you wait before updating to make sure what you need to work does work.
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10.10.5 isn't anywhere near the newest version of OS X, though. 10.11.6 is current. I suspect the OP means the newest Calibre, not the newest OS.
What steps have you already taken, tarasview? Have you restarted the Kobo and the Mac, tried a different USB port, tried a different microUSB cable? Are you pressing Connect on the Kobo screen after connecting the cables?