Urgent, a big problem happened ! I can't download and debug。

[Jin Lu]

my application is based on the BLE example: ble_app_hrs. it works well before, but when I add some functions to configure the GPIOTE , and then download to the Device, it doesn't work . And I can't download or debug or erase anymore !!! the nrfgo studio display "recover".
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[Ole Morten]

Can you please try to do a recover from the command line? This can be done by running nrfjprog --recover from a cmd prompt. nrfjprog is located in C:\Program Files (x86)\Nordic Semiconductor\nrf51\bin.

[Jin Lu]

Thank u, it works again, but when I download my application to it , the same thing happened . could you tell me why this happened ? I just want add some GPIO interruputs to the application to implement button feature.

[Ole Morten]

When an nRF51 series device is in system off, the debug interface is not available, and the chip will either have to be woken up (by pressing a wake-up button) or recovered, before being programmed again.

For the heart rate example, it can usually be woken up by pressing one of the buttons.