Here’s the detail guide on how to update software of Mercedes Benz DoIP Xentry Connect C5 MB Star diagnostic scanner. DoIP C5 comes with both internal hard drive and external Dell HDD .
1.The upgrade procedure fits for DoIP Xentry Connect C5 but no SD Connect C5 (SD C4 in C5 case).
2. If you have XDOS 2018.3 or 2017.9 not working well, you should update it to version 2018.7.
If you have XDOS 2018.5 works good, it’s not necessary to update to 2018.7.
3. If you feel complicated to update the firmware by yourself. You can send both Doip C5 HDD and Dell HDD to us to run an upgrade.
Part 1: How to remove Xentry Connect C5 internal HDD
Part 2: How to update Xentry Connect C5 software
Xentry_Kit_09_2017.iso（copy to the folder: iodd 2541 _ISO）
U disk with a Windows machine (recommend Bigbaicai WinCE)
IODD 2541 External Encrypted Hard Drive or similar
Panasonic power adapter
Xentry Connect C5 multiplexer
C5 mux in standby mode
connect the Panasonic power adapter to C5
insert IODD 2541 into the USB port on C5
in a standby mode, press “X” and “√” at the same time, then it will pop up “Start Update?”
(if not, it will pop up “Start XENTRY Connect?”. then, when the prompt disappears, it will display “Start Update?”)
When you see “Start Update?”, press “√” and Connect C5 will go into the update mode and IODD 2541 will light up
Press button “5” on IODD 2541 as soon as possible. then, the cross “X” will turn a circle “O”
what’s displayed on C5:
It will take 50-55 minutes to finish the upgrade
The system restarts after installation completes
If your system fail to start, turn off C5 mux and restart again
When C5 starts, take out the hard disk on C5 and install it into the laptop (here: Dell 55220)
Before it, pls install the Windows machine on the U disk
Press F12 when you see the pop-up “F12 Boot Options”
Select USB Storage Device and press “Enter”
Pop up the interface, and select  WIN2003 PE Classical
Go to the PE system and create an user account
Note that Windows should be located in disk D:
After path selection, right click on “Create a new admin account” on the left
User name: C5, Password: abc12345678
(You can have any user name and password you want)
Click on Ok
Close the application
Turn off the laptop
Take out the disk off the laptop and install it into C5 multiplexer
Part 3: How to activate Xentry Connect C5 after upgrade
Here’s teamviewer file explaining the step-by-step activation procedure
Files needed to activate C5:
Black list C5
Part 4: How to connect C5 SD connect with Xentry Tab/Laptop
Here’s example on connecting C5 with Xentry tablet, can be also connected with Dell D630 or Lenovo laptop.
C5 has 2 USB connectors and round power connector (power by Panasonic power adapter) on left side
Connect LAN cable and power cable with C5
Press Power button foe 3 sec to turn on Tab
Connect Xentry C5 OBD cable and LAN cable
No car connected. Because it is not connected to vehicle
Xentry Tab main menu
Open Xentry Control
Then come to this interface, wait for the communication
Xentry is connected with SD C5
Click on green icon
Launch Xentry Software
Run MB Star diagnostic software and start diagnose Mercedes.