MCU failure analysis request

[air]

Hello, I am using nrf51822 / sdk10.0.0 / S110. I write flash in SD / bootloader / application order. I use nRFgoStudio and J-Link. There are about 20% of malfunctioning samples when operating after writing. The malfunction appears to be an MCU halt state. I would like to verify this part and request a failure analysis. I want to know what procedure I can apply for. I also want to know what to prepare.

thanks.

[bjorn-spockeli]

Hi Air, all our ICs are 100% production tested at the factory and 20% is an very high failure rate. These might might come of as stupid questions, but here goes: 1) Does erasing the affected boards and re-flashing them resolve the issue? 2) Are you able to debug the bootloader? If so, does it reach the statement where it passes execution to the application? If it does are you able to debug the application?