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TUSB7340: Rev 01 of TUSB7340I fail to burn firmware into USB device's flash

Part Number: TUSB7340

In our design, we can control TUSB7340I through PCIe switch IC to burn the firmware into the flash which connect to USB device(CYUSB3014) by SPI normally.The diagram shows as below.

And we found it the Rev 02 of the TUSB7340I can be operated successfully but Rev 01 failed.In recently mass production of our project,we purchased a number of TUSB7340I, and we encountered the burning firmware issue.Then we checked and found the revision regularity which mentioned above.So,the issue is related with the revision?