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I will try to if issue occurred again.
Thanks a lot

Pressing RST button for few seconds helps.

Hi. I'm using arduino 1.6.5 on MacOS Eventually all my boards doesn't appear on Port section so I cannot upload new sketch. I used different cables and few z-uno boards. But no result. Once I pushed buttons randomly and after that board appeared in Port menu. I uploaded new sketches few times, plung...

Спасибо, все хорошо, обновился до 2.0.6

Здравствуйте, такая проблема. Купил несколько Z-uno. Со старым поколением проблем нет, а из 3-х устройств нового поколения два не прошиваются. Ошибка: Z-Uno core version and device version mismatch. You have 0.6.7 firmware version on the board. Core version is 0.6.3. Please upgrade the bootloader. П...