• Hi @fanoush

    Thanks. I will try SWD using pi zero w and take pin connections help from this post .

    Did you see some picture on OLED screen while doing the upgrade?

    Unfortunately while upgrading I totally missed display notifications so I don’t know. But I have ordered couple of more units so I will check when I will get those in a day or two.

    the update zip is just application, not backup of whole flash memory

    So that means the zip will not give me any information about GPIO, display controller etc? And I need to have backup from the flash?

    Just curious-

    What is the difference between application, firmware, soft device and boot loader in the context of nRF5x devices?

    I also found the this github repo . Do you already know about this? If this can help to get more information from the bin file.

    Another thing, where I can find cfg file for nrf51?

    Regards
    Abhinav

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