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nrf51822 programming using nrfgoStudio

Hello,

I programmed about 200 nrf51822 boards for prototype production. The order was softdevice - bootloader - application. In the process of test I saw some abnormal boards(over 30%). It seems that they go into halt state during operation, even though there was no fail in programming.

So, I have some question.

  1. If there is no fail message is it right to be regarded as a success?
  2. Is there anything special in programming?
  3. Does program include verity? If not, should I verify after programming every time?
  4. I want to program all in a time. I can merge softdevice/bootloader/application. After that, which tool could I use to do so?

That's all. Thanks.

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