The summary:
1.) Disconnect your board from usb or other voltage supply.
2.) Connect the BOOT0 Pin with High (3V).
3.) Plugin the usb cable again.
4.) Download a write programm to the board which doesn’t configure the PA11 and PA12 Pins.
5.) Disconnect the usb again.
6.) Disconnect the BOOT0 from High (3V) again.
7.) Plugin the USB again and see if the board works normal again.
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Error in launch sequence
Failed to start GDB server
Error in initializing ST-LINK device. Reason: No device found on target.
Target no device Found
STM32 ST-LINK Utility
CubeIDE
Problem Occured
Stlink device bulunamadı hatası
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