How do you perform a firmware update on a product board with the RN42/RN41?
How do you perform a firmware update on a product board with the RN42/RN41? Should you have access/control to some specific RN42/RN41 pins? Can it be performed through Bluetooth® technology?
Unfortunately, there is no way to upgrade the RN42/RN41 module in the field with a firmware version 6.15 or older. Microchip Device Firmware Update (DFU) Utility can be used to perform DFU update over UART on the RN41/42 Bluetooth module starting with firmware version 6.30 onwards. The DFU image files (.dfu) for the new release of the firmware will be provided to update the firmware.
Microchip DFU Utility download link:
http://ww1.microchip.com/downloads/en/DeviceDoc/Microchip%20Bluetooth%20DFU%20Utility%20Installer.zip.