m_m
2
try re-installing using the instructions here:
https://support.particle.io/hc/en-us/articles/360039251394-Installing-DFU-util#:~:text=Installation%20-%20Linux
also, here's what we need to help troubleshoot:
and lastly, it doesn't hurt to try a manual reset:
sorry for the bumps
hope it helps 
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