Duo 64M with arduino-milkv-duo-v1.0.9-2024-0228 image. Blinky code uploads and works OK but its lost if the board is power cycled. Where is the blinky executable stored? And can it be reloaded on a reboot?
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I guess you’re looking for the BOOT partition and fip.bin file.
Also: Flash/Reset the RTOS core on the DUO-S
SOLVED: This is some kind of file sync problem. After programming via Arduino IDE, login via ssh and either type sync, or reboot which does an effective file sync and the Arduino code is remembered for next boot up. 
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