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thank you for the quick reply and troubleshooting tips!
It turned out the micro usb cable I was using now was not a proper cable, only for charging it seems. Anyway I found a working cable, so now...

I have been using the teensy 3s on macs for 8 months, running arduino 103 and teensy 1.16, without any problems. Today I was not able to update teensies I used just a few weeks back, it just seems to...