The EVEREST models 100, 300 and 700 are all updated with the HID (Human Interface Device) tool, available in the download section for each model. This tool works with Windows computers only. The EVEREST ELITE models are updated with a USB tool available on the special Everest web page. This tool is available in both an Apple MAC OS version and a Windows version. This USB tool update is used for the first production run of ELITE models ONLY, and only once! All later production runs, and all updates after this first USB update, will take place wirelessly through the My JBL Headphone app, made for iOS and Android.