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Cannot debug the ble_app_uart on nRF52840 DK

Hallo, using nRF52840 DK with Keil uVision 5.30, I try to debug the example ble_app_uart in the folder ble_peripheral, pca10056, s140. Compilation is OK, erase/programming/verify is OK, but in debug mode the program doesn't run to the beginning of the main function, the PC moves steadly in the 0x000005xx range. What I see on the board is the 4 LEDs blinking as before, when I flashed the blynky  project of the "\nRF5_SDK_17.0.2_d674dde\examples\peripheral\blinky" folder, that works fine. What should I check to get able to debug the project?

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