Can't upload to Nibble

Just built my Nibble this weekend and it working great!

However I can’t get CircuitBlocks to upload to it. I get the same upload error message every time. Also when I try to restore the firmware. See the screenshot.

I’m using CircuitBlocks 1.3.1 on a Mac with Big Sur (11.2.1). The Nibble is turned on and CircuitBlocks says ‘Nibble Connected’.

Since my Mac only has USB-C connections I’m using an adapter to connect. But I tried a few and with the same result each time.

Any idea what is going on and how I can troubleshoot?


Dear @bob,

Apple has released an update for Mac which completely stopped the compiling and sketch uploading to all esp32 and esp8266 devices.

We’re working hard on fixing this problem.

Thank you for your patience and understanding!

Dora from CM


Thanks for the update. Good to know it was probably not an issue on my end. I’ll wait for an update to CircuitBlocks.

Let me know if I can provide additional information or test something.


Dear @bob no, it was not your fault. Keep an eye on our updates, we’re working as fast as we can to fix this problem!