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Thanks @Jameo this button hold while installing battery approach worked to get the lights firing. However the derailleur now seems to be in a firmware update doomloop where it updates through the app but then immediately identifies itself as needing the same firmware update again. All the while being unable to connect to the shifters.
JustJ4
Have you tried a different battery/checked that the battery works in another derailleur?
Tried holding the AXS button while installing battery?