GDB server for KM4

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Hi @Tuxford

  1. I believe this signature refers to the one used to determine which OTA image to boot. Refer to OTA chapter of AN0400 application note. It looks like the bootloader has been uploaded normally, but it is trying to boot from another invalid image2.

  2. Uploading a binary image is not just sending it over UART. A simplified explanation is available in this post. There is also a link to a GitHub repo where someone reverse engineered the process and wrote an application to upload the binary images.

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