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PCA10031 firmware update failed

Hi,

I would like to use PCA10031 to be a sniffer. It can't update and show as below figure.

I've also refer to discussion as below website to turn it into BOOTLOADER mode and then copy-paste the newly version of J-Link OB-SAM3U128-V2-NordicSemi 170724.bin into PCA10031.

https://devzone.nordicsemi.com/f/nordic-q-a/8144/i-can-t-update-the-j-link-ob-firmware-nrf51-dk

The LD1 keep blinking after firmware update. Is it correct?

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