Leaked on twitter by https://twitter.com/joegrand earlier:

Top of Thread: https://twitter.com/joegrand/status/1157036422454362112
Originally posted by Top of Thread
  • Joe Grand @joegrand
    TOP SECRET! This year's #DEFCON 27 Badge uses an @NXP KL27 ARM Cortex-M0+ (among other things). For most efficient hacking, use an LPC-Link2, @TagConnect TC2050-IDC-NL-050-ALL (normal orientation), and 1.8V-compatible level translator or USB-to-Serial adapter.
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