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I just saw online that there are multiple versions of the mount, the last one is compatible with the SM-EW90 junction box. I don't know which one I have, I'll see when I get home (fingers crossed).
The Di2 USB charger includes PC interface gubbins.
So my only other option is to borrow one .. Thanks!
user136820
The Di2 USB charger includes PC interface gubbins.
AFAIK you can't use the external battery mount with the newer versions of Junction A that include a charging/PC port - it'll simply refuse to function. Therefore you need the old Junction A that doesn't have a charging port (used to be <£10 on ebay).
If you still need to update firmware with this setup you need to buy/borrow the PCe1 e-tube interface (£££ and pretty rare, though a good LBS might have one).