6.2 Device Firmware Upgrade Over Serial

Device Firmware Upgrade (DFU) over serial is a feature in the Bootloader that allows users to load a new image received via a serial interface and write it into the flash memory. The DFU over serial is performed using a Python script. The following are the user guide and demonstration steps for performing DFU over serial. The demonstration focuses on upgrading the ota_ble_sensor user application with a new image.

This application developer’s guide and demonstration outline two methods for performing DFU (Device Firmware Upgrade) over a serial connection.