Instructions to update the firmware SD Connect MB C4 and MB C5

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Instructions to update the firmware SD Connect MB C4 and MB C5
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Step 1: Prepare 6 AA batteries 1.5V

You need to put 6 AA batteries into MB SD C4 (Item No.SP-100D) and SD C5 (Item No.SP255 ), but you don’t have to install batteries for DOIP MB SD C4 PLUS (Item No. SP100-E) firmware update.
You make sure to supply power through the OBD 2 port for SD connect during the update process

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Step 2: Remove the protective back cover and you will see where the batteries is installed

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Step 3: Connect power via OBD2 and connect LAN port to laptop and then open Sdconnect ToolKit

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Step 4: Start the update and wait until it's susscessfull.

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Other case: If SD Connect ToolKit error message: " SDconnect battery voltage too low 645 " or “ Check batteries ”

Cause:

+ You don't have batteries AA

+ Power supply/charging circuit is damaged.

How to solve this problem:

+ Find the file named “toolkit.ini” Follow this path \Program Files (x86)\Mercedes-Benz\SDconnect Toolkit\bin\ toolkit.ini

+ Command two line search:

MinUpdateVoltageVBatt=7200

MinUpdateVoltageVExt=11000

+ Modifying the following lines so that the supply and/or battery voltage is lower to the real (it would be enough to set them to zero)

Original​	Edited​
MinUpdateVoltageVBatt=7200​	MinUpdateVoltageVBatt=0​
MinUpdateVoltageVExt=11000​	MinUpdateVoltageVExt=0​

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Finally update and wait until it is successful

Good luck!​