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Or do I need the inline extra jobbie?
It’s the modern control box with synchro shift, but I can’t get it to connect to either Garmin or phone.
Or do I need the inline extra jobbie?
Yes... Sadly!
I went one better, and ordered my groupset (was upgrading an existing frame) with the MT800 XT Di2 control box display, rather than the normal Di2 box.
Cost me about £30 extra to replace the normal junction box with this. Not bad for built in Bluetooth and the useful display! Still no ANT+ but I'm not bothered by that, though can still add the inline ANT+ adapter if I want to.
Darn it! The instructions for the control box go on about Bluetooth but don’t even mention the adapter.
no ANT+ [...] though can still add the inline ANT+ adapter
Not only does MT800 junction have ANT+ connectivity (well, "ANT private", like all Shimano bits), but it won't work with another wireless adapter (as per Shimano specs).
Although it’s an extra cost the wee inline Bluetooth thingy is a 2 second job to fit. You’ve then got the advantage of having the Shimano E-tube app on your phone and you can customise the hood buttons to control your Garmin (to shift screens, put the backlight on for x seconds, check maps etc).
It just fits into the battery in the seatpost.