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change anything here. If the default target is not
STM32_XL_density_768k, you have to manual select the chip from
the drop down menu by clicking the arrow on the right. Then click
next, will bring you to the next picture.
5.when you see the below picture come up, click the … mark on the right
side of download to device. Choose the firmware you want to update,
the firmware end with .hex. After choose the firmware, hit the next