Boron - LED pattern

I have two boron that show this LED pattern. The process goes like this:

  1. Used OTA to flash user firmware. {same with USB flash}
  2. When the flash finishes LED --> white (very short time)
  3. LED flashes green - for several seconds
  4. LED flashes red - once according to my eyes
  5. LED flashes green again - for a short time
  6. LED flashes blue
  7. LED breathes blue
    All is well and the application works as expected.

What does #4 mean? Should I be concerned about this behaviour?

Thank you

One red blink is a handshake error. This will happen sometimes, particularly on Gen 3 devices (Boron, Argon). If it happens once, it’s nothing to worry about. If it happens continuously you could have a keys error.

Thank you - BTW: The development tools have come a long way in the last 12 months - super job.