thank you for any suggestion and after investigation of my problems, I found that my surface can’t detect the USB stick. It can be seen on the screen at below there is no icon came up. Finally I used new USB stick and copy the original file from allen-heath website. After unzip the file and copy it to the USB stick, now I successfully update the firmware V1.94
Just share:
1. copy the folder “firmware” containing all files needed for updating to the root directory of USB stick.
2. plug to the USB drive on the surface and wait about 3 seconds until USB icon comes up on screen below
3. go to menu UTILITY > Firmware > Update Firmware
It will take about 3 minutes since iLive will update TouchScreen, Mixrack and Surface in once.