This message was posted on behalf of Intel Corporation
As you are trying to flash the internal Quark SE C1000 available in the Curie module, I recommend you to post your issue in the Quark MCU community: https://communities.intel.com/community/tech/microcontrollers/content
I’m not sure if what you are trying to accomplish is possible because you are not using a Quark SE C1000 board, you are using a Curie custom board which is not the same. The ISSM supports the Arduino 101 which is a Curie based board, but I’m not sure if it supports custom boards as well.
Anyhow, the best recommendation I can give you is to post this issue in the Quark MCU community for better assistance.