Before this I'm launching my modified version of LoRaWAN_End_Node firmware, but my Nucleo Board keeps restarting and heating up so I unplugged the USB cable. When I tried to connect my board back I get a FAILS.txt file with the following content

The interface firmware FAILED to reset/halt the target MCU

I tried to connect my MCU to the STM32Cube Programmer with under reset configuration and trying all reset mode configuration but got no luck.

Other things that I've tried:

  1. Disconnect JP1
  2. Connecting while pushing the reset button
  3. Doing point 1 and 2 at the same time

And still got no luck.

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  1. Replugged the JP1 jumper and the heating issue is back (The MCU isn't completely dead, I guess (?))
  2. It is a Nucleo Board so it should be using an official ST-LINK

1 Answer 1


I believe that your microcontroller is in fact dead. If there is a problem with your board heating excessively and it cant read/write data then there is definitely a short somewhere. My best guess would be either the interface chip (connects your usb to the microcontroller) or the MCU itself is shorted. If you have a multimeter and a lot of time or a thermal camera you can see what is shorted. You might just want to buy a new development board instead, as that would save a lot of time (The nucleo is an interface that will let you easily program a MCU, not the MCU itself. It includes a crystal oscillator as well as the aforementioned interface chip along with regulators and such)

  • \$\begingroup\$ Well, the worst case is happening then. Thought it was because a minor software bug since I'm new in STM32 and the heating issue is gone because it only happens if I use the LoRaWAN. Tried on a different board and the heating issue is gone with LoRaWAN program flashed. Guess the LoRa chip was defective and somehow damaged the MCU chip. \$\endgroup\$ Mar 10, 2023 at 14:54
  • \$\begingroup\$ Anyway, are there any tip(s) to prevent this kind of thing happens (from software side since I use the Nucleo board)? I don't wanna fried the spare board since it's kinda expensive lol. \$\endgroup\$ Mar 10, 2023 at 14:55
  • 1
    \$\begingroup\$ I don't think there is any problem on the software side, It is probably a defective part. \$\endgroup\$ Mar 10, 2023 at 15:21

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