uploading problem
I put14500 batteries on board and plug usb in the uploader, the power light is on, and 2 lights blink for 1 second and dim, also hear some beeps. Then I test the uploader, the picture is the result I get.
Yesterday I tried Mac, and failed to upload, it displayed the port was busy. When I changed to Windows system, and upload some tests successfully( testbuzzer,testled) , but when I uploaded writeinstint, it was wrong.
Today the conditions are the same on Mac and Windows, all the uploading tests don't go through.

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@Rongzhong Li You know, today it worked! Not sure, what changed. Thank you for caring! Regarding the bluetooth dongle - when Bittle arrived, it was losing connection after each upload. But then I went through steps of tutorial (and quite some additional stackoverflow issues) replacing parts of software - problem was gone at some point.
Feels fun to be connected with the dog running around the room)