The iMac OS X v10.8.5 Supplemental Update 1.0 is recommended for iMacs (Late 2013) using NVIDIA GeForce GT 750M graphics and running OS X Mountain Lion v10.8.5.
This update:

Fixes an issue that may cause external drives to be ejected after the computer goes to sleep
Fixes an issue that may prevent certain USB Bluetooth adapters from working

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