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6 years ago.
Error in initializing ST-Link device.
I use Nucleo F030R8 Usually same error (Error in initializing ST-Link device. Reason: (1) Failed to connect to device. Please check power and cabling to target.)
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You don't have a board added to your account, would you please add your board and post your Mbed example code here and we can help you.
posted by Paul Staron 08 Mar 2019