µVISION DEBUGGER: Not a Genuine ST device on STM32L053R8 Board

Information in this knowledgebase article applies to:

• Keil MDK V5.28

PROBLEM

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.

SOLUTION

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

SEE ALSO

• µVision DEBUGGER: Not a genuine ST Device
• µVision DEBUGGER: ST-LINK USB Communication Error

Last Reviewed: Saturday, October 3, 2020