pca10040 cannot be found during keil download

Question

keil cannot find the board. 
 It was ok to start with but cannot find the board after erased a few times.

kanchun · Accepted Answer

Yes, it is win 10 and cannot see the jlink drive. 
 When the board plugged in, it say cannot recognise the USB device.

Bjørn Kvaale · Answer

Could you try holding the IF BOOT/RESET button, turn the device off & then on. Then, the board should show up in Bootloader mode (BOOTLOADER) as an external drive. Then, download this file (choose the latest one) & drag & drop it to the BOOTLOADER external drive. Then, if you power cycle the board, it should show up in file explorer again.

pca10040 cannot be found during keil download

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