have you gone to the bluetooth setting in the Leica and set it to APPS?
Yes. I played with it for hours trying to get it to connect to my phone with the 2800 set to app. I finally gave up and set it to lat and got it connect to my kestrel first try.
ETA : I wonder if this a software issue that a firmware upgrade would fix. Unfortunately I have no way to connect to it to upgrade the firmware.
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