This is kinda timely since it depends upon a system update. It also requires adb.

When prompted to update, click "update later".
From your command prompt, type "adb pull /cache/recovery".
You will now have a file called "command" and another called "update.signed.zip".

If you want to prevent it from updating when you turn the Vox on next time, do the following before turning it off:
Type "adb shell" at the "#" type "rm /cache/recovery/*".