I had same problem too.
I solved this with closing application STM32 ST-LINK Utility this application prevent connection with stlink because its using same connection too and when i closing this application stlink debug begun working
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- Sun May 26, 2019 6:30 pm
- Forum: Atollic TrueSTUDIO tool discussions
- Topic: Failed to connect to device. Please check power and cabling to target.
- Replies: 9
- Views: 3752