how to upload hex file in nrf51 sensor tag using nRF52840 DK?

[vivek khatri]

i was trying to upload the hex file in nrf51 sensor tag using nrf52840 DK but when i connect board with nrf connect  desktop its saw me error like this "ERROR Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: JLINKARM_DLL_ERROR (ffffff9a)"

i am follow this link for connection purpose https://learn.linksprite.com/project/use-the-nordic-nrf51-dk-to-program-openhapp-bluetooth-4-0-ble-sensor-tagibeacon-station-nrf51822-with-mbed/

help me to how i can upload the hex file in nrf51 sensor tag using nRF52840 DK.

[Simonr]

Hi

The nRF52840 DK supports programming and debugging external boards with nRF51 SoCs, so there should not be a problem doing so. The error you are seeing is generally caused by an error in your setup. If your custom board does not have a 10-pin debug header, please make sure that the device is connected to the DK as shown in the picture below.

Best regards,

Simon

[vivek khatri]

thank you.

it's working now.