Make sure your computer hardware version is higher the MB Star C4 or MB Star C5 version, otherwise, CSD will show update failed . Bootimage can update successfully. The following picture show how to check the mb star c4 or mb star c5 version

The following picture is show your computer hardware HDD software version

If their software is not same, it no need update ( because factory has upgraded the latest version of the mb star c4 or mb star c5 machine)

If customer not use our HDD software, it will appear read vehicle failed problems.

Solution as following

(1) Mb star c4 or mb star c5 supply power to confirm the machine was turn on, like the following picture ( If now show the three icon, it means the mb star c4 or c5 main unit is broken）

(2). connect LAN with computer, confirm computer IP change to172.29.127.118, like the following picture :

(3)  change of software using pattern (Because you modify the software for the firmware upgrade mode, the software is not test the vehicles)The following picture is show the software is upgrade mode

The following picture is show test read vehicle mode.

Three files name Update_automaticx , Update_manualx ; Update_SpecialxThis is read vehicle mode, if can not read vehicle, please change files name, then restart computer

source:

https://www.obd2tool.com/blog/2017/03/17/solution-about-mb-star-c4-mb-star-c5-update-and-can-not-test-vehicles-problems/

Want to know more details for MB SD Connect Compact 4 ? Please check the FAQS as following :
Q1: Is SD C4 compatible with window7?
A: It is not stable on WIN7,suggest you not use WIN7, 90% sd c4 software get broken because of the usage of WIN7.

Q2: Hello ,I want to have dell 630 format sd c4,does any request on my computer?
A: If you buy the fit all HDD,then you have to use on XP system,if you choose Dell D630,then no request on computer system.

Q3: Hello, can you send me some picture about mb sd c4? Please tell me more detail,thanks!
A: ok,no problem, it has user manual in HDD,it need activate, this tool you can choose connect with internet by LAN cable or WIFI,when it connect with car,you will see:usually after activate,it will be no problem at all,this item is very stable.

Q4: Is DAS available with 21 languages and optional to reset? Or only English available?
A: The DAS on the desktop is only English available, after enter into Xentry you are allowed to set the language you want. Just enter into Xentry whatever car models you want to diagnose, and if the car model should be diagnosed and programmed in the DAS but you enter Xentry, it will automatically switch into DAS and the DAS language will be as the same as the Xenty language.

Q5: I will be using this to activate cruise control installs on 2012 MB B and C class cars. This will work?
A: our engineer say it can do . BUT it depend on cars ,some cars not, have Cruise control function,then cannot do,and it need you know how to activate it.

Q6: When I click “Diagnostic” to find “Fingerprint ID” of mb sd c4 2019.05 , I got an error” Internal error (3.17)- 3.89 You must contact the user help Desk “.
A: Check whether your computer is compatible with sd c4 2019.05 software. If you choose d630 hard disk, it needs to work with Dell D630 computer with integrated video card and 1GB memory; if you choose movable hard disk, it’s requirement to the computer is: CPU 2.0GHZ or above, 2GB memory or more, Windows XP professional.

Q7: When I connect to Wireless Network Connection, I got the following display, what should I do?
A: Just ignore this message and follow our video tutorial to set.

Q8: when I setup SD connect compact 4 hard disk; I got a message reading “No access authorization code! Please contact the Star diagnosis call center”.
A: It needs activation, please send us Hardware fingerprint, LAN-ID and HW-ID, then we will help you active. As for how to get Hardware fingerprint, LAN-ID and HW-ID.

Q9: Mercedes Star Diagnostic MB SD Connect Compact 4 Star 2013.03 update error: the software update was aborted. Please repeat the update process. (662)
A: do not update MB SD Connect Compact 4. You are allowed to update hardware version to 2.02, not 2.2.

Q10: After I get MB SD connect c4 activation file, I have no idea how to use it, active by star utilities or by EWA NET?
A: We have video tutorial, please click column “Video” to watch. Important note: make sure enter EPC from “EPC NET EXPLORER ” and find out LAN ID, finally active it.

Q11: MB SD C4 has error after click “Select MUX”, Status “No Signal”.
A: Please connect to “Local area connection”, and set IP address: 172.29.127.114, Subnet mask: 255.255.0.0. for the details, please watch the video tutorial by clicking column “Video”.

Q12: When I open EPC of MB SD C4 2012.11 (SP100), I got error message “unable to start application program”, what’s the reason?
A: Firstly, make sure EPC is activated. Secondly, make sure enter EPC from “EPC NET EXPLORER ” and find out LAN ID, finally active it (A part of users tend to directly start EPC from Xentry, this is not correct.) Still have got the same error? Please contact us for remote assistance.

Q13: How to install MB SD connect c4 starfinder?
A: it doesn’t need to install starfinder, directly open “c:\program
files\web_etm\index.html “.

Q14: My moveable hard disk of MB SD connect C4 has no display. Does it use USB cable to connect the hard disk and then active?
A: Yes, use USB cable to connect the moveable hard disk and the computer, firstly install “setup.exe”, and then import Mercedes Benz software, the computer configuration should not be too low.

Q15: Working with SP100, I wanted to change the way fuel consumption is calculated in the KIW module. This is done in option 1772 of KIW, only adaptable with the developer version of DAS (see FOTO.JPG). Since when starting I have to agree to the special “dangers” the developer version implements, I thought I would be able to change that value. But there is no modify option available
A: the way of fuel consumption cannot be changed; you are allowed to choose option 1772 of KIW.

Q16: After I connect MB SD C4 to the car, SD C4 has no voltage on the PIN8 OBD cable, but when the ignition key on the second position, the PIN8 cable voltage is 12V. What’s the problem?
A: It suggests you don’t start the car, after the car start, the PIN8 will display voltage value.

Q17: Xentry error reading “Internal error: (3.17)-3.173 you must contact the User Help Desk”
A: Don’t set the file “lic-key-2” as “read only.

Q18: How to set MB SD C4 WIFI?
A: Firstly, disconnect the local areal connection, then connect the sdconnect 4 with the car and start the car, finally connect to the wireless connections, please follow the next instructions to set: click Configuration-MUX-Register/configure, under the “General information”, select name “04” and then tick off “Wlan parameters, road”, then set the following parameters: IP address: 192.168.2.200, Network screen: 255.255.255.0, Encryption: WEP/Hex, Key: aaaaaaaaaaaaaaaaaaaaaaaaaa (26 a in total), we have video tutorial, please click column “Video” to watch or contact our customer service to send you.

Q19: When I start DAS, it says that, I am using the developer version. In some menus however the software does not seem to be a developer version.Is it or is it not a developer version? am NOT connected to the internet when diagnosing a car. Only the SD-Box is connected to the notebook via WLAN. Could that be the problem?
A: Have you set the “sdc4″ well? Could you please do a self-checking for your device? Then show me the result of the self-checking. Please refer to the following steps of self-checking.
A: Did you have the SD C4 set well? Please follow the next instructions to have a self-test, and then send us the self diagnostic report.

Q20: MB SD STAR C4 (SP100) is unable to self-test?
A: check whether the COM PORT is COM2, if it is, there are four possible reasons: 1) the COM PORT has problem; 2) MB SD C4 and the computer has a poor connection. 3) The cable or SDC4 doesn’t work; 4) SD C4 disconnect with the car.

Q21: Why MB SD C4 is unable to connect with the computer; even after I try LAN cable.
A: It needs to set the IP address. How to set the IP address?
Start-Connect to all connections-Local Area Connection-right click “Properties”-Internet Protocol-Use the following IP address, IP address: 172.29.127.114, Subnet mask: 255.255.0.0, finally click “Ok”, we have video tutorial, please click column “Video” to watch or contact our customer service to send you.

Q22: When I do self-diagnosis for MB, I got error message: 3001 Error.
A: Self-diagnostic has error not suggest MB SD C4 has problem. The aim of self-diagnosis is to check whether SD C4 connect well with the computer and the car, whether the IP address and parameter is set correctly, whether the SD connect c4 and the driver has successful communication. We have video tutorial on how to do self diagnosis for SD C4, please follow it to operate, if you are able to self-diagnostic, it suggests MB SD C4 settings is OK, the connections is OK and it has communication between MB SD c4 and the software. Just go to test the car, if you got any errors, screenshot them and send us to judge where the problem is.

Q23: Does MB SD C4 support SCN coding?
A: Our SD C4 hardware support offline programming, but the software needs to active, and it will cost additional money.

Q24: MB SD C4 could read chassis number for Smart 1998, but unable to test ECU after connected with the car.
A: It needs login password when test Smart, we have DAS SMART Calculator (Item No. ss27) to help calculate login password.

Q25: Which tool can diagnose Mercedes Benz Trucks, 3335, 1823 and 1413?
A: MB SD C4.

Q26: Which tool can diagnose and program for Mercedes Benz BUS body.
A: MB SD STAR C4 (SP100).

Q27: Which tool can diagnose ML 270 2005 and A class W169 2007?
A: MB SD C4.

Q28: Where to find Smart TAN CODE in the software of MB Star diagnostic tool Star C4 ?
A: Sorry, so far we have no Smart TAN code, advice you go to 4S store or original factory to consult.

Share an easy way to repair sd connect c4 multiplexer if your multiplexer is dead, not powering up via any adapter cable.

NOTE:
TRY AT YOUR OEWN RISK!

First open the MB SD C4 main unit. Slide PCB out a little bit, from the connector side, so you can see the units buttons wiring. Carefully pry the lock out & up, after that you can pull the wiring and PCB out.

Then Open 4 Main PCB screws, Carefully wiggle the PCB off from another, it might be pretty tight, so carefully, side from side!

Disconnect the LAN cable, carefully, pretty easy to break the small clip.

Then you can disconnect the Connector PCB, very carefully, might be really thight! Again slowly from both sides. You now have access to the small Fuses.

You can use multi-meter to see if they work, usually the LAN connector side 5A is burnt. So desolder the broken one, install new & enjoy your powering up mux again!

This repairing above requires experienced and professional techniques; or you are suggested to buy a cheap clone MB SD Connect C4 of high quality to replace it. Google to get the good one. I helped to put the first site here for you (no affiliation to the vendor)

New Arrival: Benz Ecom diagnostic and programming tool for newest Benz models. It comes with Dongle and software in the hard disk, activation via remote assistance. Works with newest Benz models instead of old models like MB SD C4.

1.Ecom
Support diagnostic software Xentry, engineering software Vediamo and super DTS Monaco,  it has a than higher access right than SDC4.

Ecom supports the CAN/DoIP protocol, which can be used to diagnose and programming (brushing & writing) for the new car audio and video entertainment systems.

The Mercedes-Benz engineering database of diagnosis / coding / retrofit /flashings is using the Xentry database, so the Mercedes-Benz engineering version depends on the version of Xentry, as long as the database is new, the V4.00 version can be used on new models. compact3 can be used.
SDC4 does not support ODX documents. The latest V5.00 uses eCom to support ODX files. It is recommended to use Ecom, with DoIP function, the speed is faster and more stable.

2.SD C4
Support the diagnostic software Xentry, DAS software diagnostics, engineering Vediamo,  super DTS Monaco, Xentry and DAS Developer mode etc.

Common Name: Developing Data Engineering Edition After 2010
Version, added a lot of functional restrictions. So everyone will encounter the problem that the vehicle version is too new to enter
the control unit, or entering the control unit and cannot make any special modifications. For example: W204 /212 2012
The instrument is needed to modify the regional language configuration or open other convenient functions. With the increasing number of new car with DoIP protocol, the mb star SDC4 has slowly failed to meet market demand.