NRFJPROG ERROR return code 9

Question

We are developing a test jig that also programs the Nordic nRF51822 on our board. 
 We are receiving the following error message from the command line programmer:
NRFJPROG ERROR: nrfjprog encountered an error condition that should not occur. Please report the error to Nordic Semiconductor support with the text "write_and_verify_hex_file: return code 9" 
 What are the conditions that cause this error?

Chris Alfred · Accepted Answer

We have generated non-overlapping hex files and we have not seen the return code 9 reported. 
 However, we are very concerned that the programmer was not consistently failing if it really can not handle overlapping files - what was it doing when it did not produce the error! 
 As we a programming thousands of the nRF chips in production, we need to absolutely sure the programmer is programming correctly.

NRFJPROG ERROR return code 9

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