Cannot program USB-8452 into I2C High Speed Mode 3.33MHz

Hi, I am using the USB-8452 as I2C high speed host (1.11MHz ~ 3.33MHz) to access slave IC. But I cannot program the host into 3.33MHz with "NI USB-854x I2C Configuration" in the driver. The max speed only reach 1MHz (Fast Mode Plus) thru scope observation. Please tell me what's wrong in my program? Thanks in advance.
Attachments:
I2C Read All.vi ‏53 KB

Hi,
Do you currently use the NI-845x driver version later than 2.1?
Please check the following message.
http://www.ni.com/pdf/manuals/373865a.pdf
The NI USB-8452 in this kit has been updated to a firmware version that is
incompatible with NI-845x driver versions prior to 2.1. If an NI-845x driver
version prior to 2.1 is installed on your system, you need to upgrade your
driver by using the enclosed installation CD or downloading the latest
NI-845x driver from ni.com/downloads.
If you cannot upgrade the NI-845x driver on your system, you can refer to
an online document for additional options. Visit ni.com/info and enter
the Info Code 8452FW.
BR
Ting

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