Error 1555 - Check the update accounting system
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08/04/2023
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08/04/2023
After updating the MIB and not only) an error occurs:
1555 - Check the update accounting system
B201A 00 [009] - -
[Check software version management]
Confirmed - tested after removing entries
Freeze frame:
Status bits: 00000001
Priority: 6
Error occurrence counter: 1
Oblivion index: 189
Mileage: 227629 km
Date: 2023.04.08
Time: 13:37:07
Terminal 30 voltage: 13.1 V
Status_Software_Version_Management-module_name: MFC1P73xE/HRUN
And we see this window:

But with the help of an engineering calculator, diagnostic equipment and this article, you can easily get rid of this error.
Let's get started. Go to and enter access code 20103:

after which we get a positive input window:

Next, in the adaptations window, select "IDE02502 - Confirmation of installation changes":

Let's see the data and open the calculator:

Open the calculator in programmer mode and HEX input mode:

We enter the obtained values according to the formula:
4D86 (our adaptation value)
XOR (Exceptional disjunction, addition modulo two is a logical and bitwise operation)
C9D2 (magic values that help fix the situation)):
4D86 XOR C9D2

XOR is selected here

We enter the obtained values in the "data input" adaptation window:

Execute, reboot, admire:

Take care of yourself and your car. Have a nice trip and travels.