An update boot (aka TE USB FX2 firmware update) is a multi-step boot operation. It follow this steps.
Follow the same procedure desrcibed in
TE USB FX2 module with the USB EEPROM enabled (when TE USB FX2 module is powered on) should be already inserted at this point.
Open a USB Firmware Upgrade Tool (double click "ofut.py"). Case A is considered true from now on: TE USB FX2 module is seen under Device Driver as a Trenz Electronic Device.
Press the "..." button (it means for "Select *.iic file or enter file path”) at left of "Program USB" button corresponding to the firmware file pathname selection
Select a suitable .iic firmware upload file. You can download the firmware availbale at Trenz Electronic GitHub.
Press the “Program USB: write IIC EEPROM” button if you want the *.iic
file to be written into the large EEPROM of the EZ-USB FX2LP USB FX2 microcontroller.
When the progress bar reaches 100%, the following log text message notifies the successful completion of the USB upgrade procedure.