I am having issues with ST-Link and my STM32 Nucleo-L4R5ZI Board

[KNguy.3]

We're using the STM32 Nucleo-L4R5ZI

The issue is that whenever we try to check the ST-Link using STM32Cube Programmer or ST-Link Utility, it won't connect to the board.

We kept getting errors like

• "STLink USB Communication Error"
• "No STM32 Target Found"
• In STM32Cube Programmer, we got the error "st-link error (dev_usb_comm_err)" and "st-link error (dev_connect_err)"
• Whenever I connect in the board through USB, the ST-Link LED is red, I'm guessing that means something is not working properly

We've tried using different USB cables and USB ports on different computers, we tried uninstalling STM32 related programs, reinstalled them, and updating drivers, but nothing seemed to help.

When looking at "NODE L4R5ZI", there's a text file named FAIL.txt, with text saying "The interface firmware FAILED TO reset/halt the target MCU". 

[Uwe Bonnes]

Are the jumper set. Compare the settings to the user manual!

[KNguy.3]

Thanks for responding Uwe,

Yes, the problem was with the jumpers, specifically JP5. After fixing that, it worked perfectly fine.