@cek Thanks very much for your prompt response. I did backup EEPROM of my OPENIMU300ZI . Unfortunately, I may pick up the wrong size number when backing up it . When I try it now, it is unsuccessful anymore. So I have to follow the procedure described in my attached link.
After connecting imu with my PC, I check the device manager, it shows:
I think IMU is connected through 4 virtual ports: COM9, 10, 11, and 12.
My steps are shown as below:
I am not sure which port index should be selected. Actually, I have tried with 1, 2, 4, and 5. No matter which port index I selected, It always shows "COM1: 230400 open failed".
Could you please provide me further instruction?