I have installed "Motorola Device Manager" from Motorola site https://motorola-global-portal.custhelp.com/app/answers/detail/a_id/88481 It says that it includes "USB Driver".
I open the device manager, I can see under "Portable Devices", there is a "MZ604"; under "Universal Serial Bus controllers", there is a "USB Composite Device". But there is a "MZ604" under "Other devices".
I still can't use "adb devices" to see that Pad.
Does anybody can help?