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Redbear duo stuck on magenta blinking after successful upload via arduino

#1

I tried everything based on this forum also on redbear duo documentation, But unfortunately i always facing same problem. my RB Duo keep blinking magenta color after i upload example code duo_blink using arduino v1.8.5 . I do research it seems stuck in safe mode based on this link (https://docs.particle.io/guide/getting-started/modes/photon/), i follow any similar issue instruction but still no luck.
i also tried call function SYSTEM_MODE(MANUAL) or WiFi.off() but the result is same thing.
anyone can help?