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firmware update on PCA10040 kills debugging

I am working on PCA10040 board using Keil u5 debugger (V5.23.0.0, JLink setup). After accepting the continuous firmware update requests I get the error message "Missing core identifier for device E31ARTY" and Keil doesn't longer identify the code in my source files. It's all text now, no breakpoints possible. Is there a fix or a way back?

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