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STM32F407VG wont boot after Flash

Question asked by huesser.noah on May 17, 2015
Latest reply on May 17, 2015 by Clive One
Hey guys!

I have an STM32F407VG on my board. I am able to bring it to the dfu mode.
Then I am able to flash it using DfuSe ( or using the dfu-util for Linux. Both report to have successfully completed the download.
My whole command is: dfu-util -d 0x0483:0xdf11 -c 1 -i 0 -a0 -s 0x08000000 -D my.bin
with those: 
  -d --device vendor:product     Specify Vendor/Product ID of DFU device
  -p --path bus-port. ... .port     Specify path to DFU device
  -c --cfg config_nr          Specify the Configuration of DFU device
  -i --intf intf_nr          Specify the DFU Interface number
  -a --alt alt               Specify the Altsetting of the DFU Interface
Now when I powercycle my STM32, it doesn't seem to boot at all. RTC-Oscillator does not run, LEDs that should instantly blink do not blink. And most important (since all those could fail because of bad software): DfuSe does not recognize the STM32 in Application mode.
Does anyone have an idea what could be wrong and holding the STM32 back from normally booting?

Thanks and best regards,