I bought one of these dev boards from ChinaAli and have attached the schematic for reference in case anyone ever needs it.

If the website would let me I would upload an image. The board is basic but has SDRAM and external FLASH, USB, LCD interface and 2.54 breakouts.  The board can be programmed via the USB (usart) port as well as program header,  A short cable is supplied for this.


STM32H743IIT (from seller).pdf

I am using it to aquaint myself with RT Thread  which seems to be a great microcontroller RTOS.  I did play with Zephyr OS for a few days but decided it would drive me to drink too much.

Enjoy.

Useful with SDRAM on board. The DevEBox one I have doesn't have extra RAM.

A photo: