Intel Quark SoC X1000 User Manual page 26

You will see a display similar to this:
The CapsuleApp will update your SPI flash image. This process takes about 5
minutes.
Warning: DO NOT remove power or try to exit during this process. Wait for the prompt to
return, otherwise your board will become non-functional.
9. When the update completes, the board will automatically reboot. You will see a
display similar to this:
Intel ® Quark™ SoC X1000
BSP Build and Software User Guide
26
Programming flash on the board using serial interface
Order Number: 329687-007US