How to fix the MBED firmwareΒΆ

This procedure has to be followed only if the MBED mass storage it isn’t recognized when you connect the board to the PC and the MBED drivers are installed in windows. The board uses the MK20 microprocessor in order to implementing the MBED interface. In this guide we will upload the firmware for the MK20. In this way the MBED interface will work again.

  1. Connect the board to the PC via USB cable.
_images/board_usb.jpg
  1. Switch on the Lora Sensor Node keeping the S3 button pressed.
_images/board_usb_on.jpg _images/board_s2_s3.jpg
  1. If the previously steps are done correctly will appear a window named BOOTLOADER.
  2. Download the file k20dx128_kl26z_if_mbed.bin.
  3. And copy the file k20dx128_kl26z_if_mbed.bin into the BOOTLOADER mass storage.
  4. The Green led on the board will blink while the file is programmed into the device flash memory.
  5. Unplug and replug the board from the PC. If the procedure has been successfull will popup the MBED window.
  6. Now with the MBED window it is possible update the firmware for the KL26Z microprocessor. See the Quick start guide for firmware 1.4 or major paragraph.