I tried to update the mux but saying battery too low.
Your MB Star C5 host needs to install a new battery before proceeding with the firmware upgrade. Please buy new battery: 6 units Ni-MH Rechargeable batteries, Size: AA, Voltage: 1.2V.
Please follow this article on how to install battery for C5:
***For new sdconnec C4 Plus / MB SD C5 with DoIp, you can update the firmware without installing battery.
The next question is: I have gotten the batteries, I am trying to configure the toolkit.
Replied: Refer to the following picture to set, password:26 a
Do not tick off Wlan parameters, workshop. and Choose web/hex here.
Finally, MB SD C5 is working. And ready to do diagnosis or programming.