This procedure explains how to update the firmware on your Calisto P620 speakerphone, as well as its USB adapter.
There are separate update procedures for the base unit and the USB adapter.
To update the speakerphone:
NOTE: To perform the update, you'll need to have Plantronics Hub software installed. You can find it at http://www.plantronics.com/us/product/plantronics-hub-desktop/
To update the BT300 USB adapter:
NOTE: You need to use Plantronics MyHeadset Updater to update your BT300.
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