[JarsaR]

Thanks for your replys.
Strangely the MUX works perfectly in two diesel w211 I have, no problems at all
Does anybody know what chip this UART is on the board and is it hard to find new one and replace it by my self + ask for partial refund? Or should I just send the MUX back to seller and take my money back?

Do you have fully charged and calibrated batteries in?

How can I calibrate the batteries? I haven´t got the batteries to work properly in any of the china clones, when I´ve installed them?

Hey,

i usually charge the batteries fully, before putting them into unit.
After that, just leave the unit in car charging, batteries will be calibrated in few hours. You can see from the display, when the batteries are calibrated, the line enclosing the battery image, will turn solid.