Arm Mbed OS support forum

FRDM KL05Z connot be recognized

I used Win10 with FRDM-KL05Z, after I install the PEMicro driver and connect the board.

The board can be recognized as

.
and it appeared as a disk named KL05Z or bootloader. However, I cannot open it or drag anything into it.

After a moment the driver disappeared and the PEMicro openSDA device disappeared and becomes Unknown USB device with code 43.

Anyone can help me on this?