promicro blinky

[BvdPdebilt]

Hi, I created a blinky sample for the ProMicro board. Entered the flash mode as mentioned in https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/boards/others/promicro_nrf52840/doc/index.html But when dragging the uf2 file into the NICENANO drive, the red led will blink fast, no matter what I used as a SLEEP_TIME_MS. It looks like the application is crashing. What could be wrong?
I tried both with and without ONFIG_BOOTLOADER_MCUBOOT=n

Regards,
Bob

[luyicheng]

你好！您使用的是 Nice！nano v2 兼容板，还是 ProMicro（以前称为 Supermini）？我还有一个相同的开发板。前几天，我尝试使用 Arduino 进行编程，不小心点击了 Arduino 软件上的“Burn Bootloader”选项。从那时起，开发板就无法再被识别为 USB 闪存驱动器，甚至 Windows 设备管理器也无法检测到它的存在。我尝试短接 RST 和 GND 引脚，但设备管理器或微控制器上的 LED 都没有响应。现在，开机时，蓝色 LED 会一直闪烁。我怀疑 bootloader 已损坏。您能告诉我如何解决吗？