My experience of the e-tube stuff is that if the firmware levels are different then it won't work/won't work well.
I plug everything together on the bench, update the firmware, check that it all shifts, then put it on the bike.
You'll need the firmware updater/PC link for this - I can lend you mine, better to buy it though if you have the funds.
Putting it together on a bench and shifting gears is the best bit with Di2!
@Smallfurry started
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My experience of the e-tube stuff is that if the firmware levels are different then it won't work/won't work well.
I plug everything together on the bench, update the firmware, check that it all shifts, then put it on the bike.
You'll need the firmware updater/PC link for this - I can lend you mine, better to buy it though if you have the funds.