(adsbygoogle = window.adsbygoogle || []).push({}); im on 4.70 rebug d-rex and im about to downgrade to 3.55 so I can change my MAC address so I have the rebug downgrader in usb ready and on the system update screen where I select Update from system storage, at the bottom of screen it says... update data of version 2.16 or later can be installed on this system....
any 1 tell me what that means please?

It's saying that the lowest firmware version that can be installed on that system is 2.16. If you're just going to downgrade to 3.55, ignore that.