Hi Duan,
I suggest update to the new firmware that was released on Dev,4.
http://www.pemicro.com/downloads/download_file.cfm?download_id=346
USB Multilink Universal Resource CD (10275 KB)
don't forget use firmware updates tool to update the firmware.
for example, if you work with 8/16bit MCU, you need udate firmware to support RS08/S08/S12(X)(Z)/…, see below screenshot:

If the target is PPC5xxx, choose setting as:

Can this help you solve the problem?
Have a great day,
Jennie Zhang
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