Prerequisits
STM32 Cube Programmer should be installed
https://www.st.com/en/development-tools/stm32cubeprog.html
Windows Driver Kit should be installed
https://docs.microsoft.com/en-us/windows-hardware/drivers/download-the-wdk
an RFID reader should be connected
a USB A to micro-USB cable should be connected
Process
Notes
The Firmware Updater Tool retains the original Application Key for each device. Thus, if the device will continue communicating with the same Gateway, then there is no need to update the device credentials within the Gateway.
Photos of opening a device
Problems and Possible Solutions
If flashing fails, try plugging the USB into a powered USB hub
If flashing fails, try a different USB cable