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UM3 loading print-core BB says AA is in?

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As dorky as it sounds, try to clean the back connectors with Isopropyl alcohol. I like to use 99% pure to cut down on contaminants.

I switched a BB core out with an AA core and then back again and I must have touched those tiny, delicate contact points in the back and it would not make the adjustment. Cleaned it with the alcohol and it worked again.

I now make sure that I do not touch that area, but it is good to clean every now and then as air pollutants (Dust, moisture, etc) will eventually crud it up a bit.

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