UART flasher FLASH LOADER DEMONSTRATOR, version 2.8 does not support STM32F730R8

I just received my new boards with STM32F730R8.

I have always done UART flashing (*.hex file) that worked great on all other devices (STM32F1xx).

But it does not work with STM32F730R8.

Here I do not have the abilty to flash with JTAG.

The latest FLASH LOADER DEMONSTRATOR, version 2.8 does not support that device.

It connects to the target but then it does not list the device.

All included *.dll files are old, from 2015.

What can I do?