8.4 Firmware Upgrade Using Mobile App (MBD)

To perform the firmware upgrade using a mobile app, the OTA DFU process involves a combination of HOST OTA DFU and Serial DFU processes. Initially, the firmware image is sent from the OTAU manager, such as a mobile device, which initiates the HOST DFU process. This process ensures that the firmware image is securely transferred through the RNBD350 and, subsequently, saved on the host device. After the transfer and storage are complete, the tool will initiate the serial DFU process. This step involves writing the previously saved firmware image onto the RNBD350 itself. Completing this process results in the successful upgrade of the firmware within the RNBD350. Thus, the OTA DFU in the RNBD350 comprises both the HOST DFU and serial DFU, ensuring a reliable and efficient update mechanism.