Can I update my Voyager Edge from my Galaxy S7?
No, you can't use a phone (Android OS) to update the firmware of the device. The device requires a PC or a Mac as said on the official website: "You can update your headset firmware using a USB cable and computer with the MyHeadset Updater tool installed."
You can download the updater from the following link: http://www.plantronics.com/us/category/software/