this is the procedure, must be quite the same in Zumo
Within that folder you unzipped the firmware and you will see 2 files. (With an extension. RGN, the other is the program exe )
Drag the RGN up the exe. (This should open the program). At this point select USB "device." (Do not plug the GPS into your computer)
Place the GPS pre-boot mode:
- Turn on the GPS and after put your finger on the battery icon to enter the diagnostic mode. Then click Exit.
- When you restart the gps, put your finger on the top left corner. (And on the same corner, almost off-screen)
- Once the word appears written "system " in green above the logo of Garmin, connect the USB cable to your computer. Your device should appear in the list of Devices. (Connect system disappear before the word)
- Once listed, a fast take on program OK.
After giving the OK on the Updater, make him wait until the end, when it will reset itself and give the message of success in the program.