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µVISION DEBUGGER: Not a Genuine ST device on STM32L053R8 Board

Information in this knowledgebase article applies to:

  • Keil MDK V5.28


After updating from Keil MDK V5.27, when I try to download or debug my Nucleo STM32L053R8 board, µVision returns the following error:

Not a genuine ST Device! Abort connection

I tried changing the Connect setting (Options for Target, Debug tab, Settings) to Under Reset but that didn't help.


Please change the Connect setting to with Pre-reset for this board, then save your settings. Your board should download and debug properly now.



The following Discussion Forum threads may provide information related to this topic.

Last Reviewed: Saturday, October 3, 2020

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