Has anyone use STM32 development boards and build the controller

Hardware Other Hardware
1

if so any good instructions how to install the IMU and Flash the board with Bootloader and Arducopter Firmware

STM32F427 flash Cortex M4
ST STM32F4DISCOVERY
STM32F407VGT6 ARM Cortex-M4
STM32F407ZxT6

cant seem to find clear direct instructions for these boards

2

There are no clear direct instructions for those boards.

But there are generic clear and direct porting to new board instructions