Oh nice thanks for the workaround, just tried a similar udev rule and it
seems to work great.  Re-enabled modem manager service, applied the MM
ignore value with a rule, and can see the /dev/ttyACM* port stays the
same between resets of the device.  We'll add it to udev rules we tell
folks to use when using the hardware (rule is here if you're curious:
https://github.com/adafruit/Trinket_Arduino_Linux/blob/master/99
-adafruit-boards.rules).  Thanks!

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https://bugs.launchpad.net/bugs/1473246

Title:
  MediaTek Preloader on a mobile device triggers cdc_acm kernel module
  usage by ModemManager

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