Like @Vchat20 said, this is the reason for the USB hub, however for the MAPS you need to do the following
Since you have somehow installed without MAPS what I would suggest you do is this
Set your Syn3 Updater to be like this
And then on the main screen do this
(you don’t have to use 21265 but it’s the newest so i would recommend it)
If you have set the settings correctly it should show as Install Mode Downgrade, Forced No and My20 Protection Disabled.
Once that has done the whole process, insert the USB and it will reformat the entire unit this time with maps (again not sure why you didn’t have maps before hand)