Download image to AMB23

I have an AMB23 development board Ameba RTL8722DM mini Board - Wireless Dev. Board/ Cortex M4 / TensorFlow Lite - Seeed Studio and have followed the guide on ambd_amazon-freertos/AmebaD_Amazon_FreeRTOS_Getting_Started_Guide_v1.3.pdf at master · ambiot/ambd_amazon-freertos · GitHub which is for the AMB21 board. The IAR project builds and I get all images but the ImageTool used for downloading the images to the board does not seem to work for the AMB23 board. Anyone know how I can download the images?

I’ve tried a random project in Arduino IDE and I’m able to compile and download that image and it runs on the board, just to make sure the hardware and connections work.