From April this year, we already started to make the sample USB DOCK IN cable specially for the micro USB port at the back of the K5.
Because the micro USB port was 11-pin, the core of that special USB DOCK IN cable might be about 10mm in diameter after our estimate. Yeah, it was a bit thick.
In order to make the technical index of this cable be same as the K5's docking connector, we continued to debug its output parameters and linear impedanc. We finally solved the output parameters issue, even though the debugging process was not smooth at firstly. However, when starting to test the sample cable with the K5, we found the X series music players including X3II, X5II, X7 can NOT work as a DAC with connecting this USB DOCK IN cable. It would be required to make some very big and difficult technical changes on this cable if we want to solve this DAC issue.
Therefore, looking at the above factors, including the large diamether of this cable and the difficulties in solving the DAC issue, which cause this USB DOCK IN cable can not implement the exactly same functions as what the K5's docking connector does, we sorry to inform you we decide to cancle the project of this USB DOCK IN cable specially for the K5. Moreover, we will revise some related decription about this cable on our official website or the user manual for the K5 later.
So sorry for all the inconvenience which the above decision has brough to you! And any understanding will be highly appreciated.