Hi,
USB stick with a file called "backupstick.txt" on it.
Shove in front, and then blue button, find complete backup in the menus. Select the USB colour button (Green perhaps? - will be obvious on screen). it will take maybe 5 mins.
Then stick it in front of the new box and power on - hopefully it says FLASH on the screen. If not it might say USB something. If so press the power button on the front of the zgemma and now it should say FLASH.
Once finished its all done. Go in and change the line details.