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@Alan_tbt
Is it possible that there was an error in the firmware update?
You can reapply an old version. Check it’s ok then try to re-apply the new version. The instructions are here near the top.
http://carltonbale.com/shimano-di2-everything-you-need-to-know/#compatibility
I’ve never done this. I run a mixed version of 6770 levers and front mech with a 6870 rear and an internal battery so never let my pc near the setup in case it stops working.