Hi, there’s a forum thread about this that another user had to deal with the same issue. You have to disable the security setting on Mac that disables programs from having access to HID devices.
See here: RT1062 bricked and cannot connect to IDE - OpenMV Products - OpenMV Forums
This is an issue with the default security settings on Mac disabling how the bootloader loading program communicates.
→ [SOLVED] HID permissions in OSX - #2 by loopier - Questions - scsynth