CGDI BMW Read/ Write N13 DME ISN and DFLASH No Need 12V Supply

How to use CGDI Prog BMW to read/ write N13 ISN and DFLASH without opening the DME shell, punching and no need 12V supply. Here is the step-by-step guide to use.


CGDI BMW programmer+ N13 read ISN authorization


One professional OBD cable made by CG Company which is special for reading and writing DME ISN

N13 is same as N20, the difference between them is that the back of N20 is a smooth plate, and N13 back is iron bar which is felt concave and convex.


Follow the wiring diagram in the CGDI BMW software

There are 6 Pin feet on N13 DME

Connect 12V cables (2 red)

Connect CAN-L and CAN-H cables (1 yellow and 1 green)

Connect GPT-0 cable (1 brown)

Connect GPT-1 cable (1 purple)

Connect GND cable (1 black)

Note: When connect all the cables with DME well, please confirm it again with the wiring diagram in the software.

Go to CGDI BMW software

Click on “N13/N20/N55/B38 read ISN”

Select N13 chip and click “OK”

There are 5 options: Wiring Diagram, Identify, Read ISN, Write ISN and Back

Click on “Identify”

Read out the chip, ISN and hardware ID

Click on “Read ISN”

Getting authorization…

Read DFLASH and ISN successfully

Copy the ISN

Please kindly notice:

ISN can be read, write, modify and change second-hand DME

Click on “Write ISN”

Read DFLASH success

Save DFLASH data

Paste the ISN has been read

To distinguish the ISN from the original one

Change the last two digits to “88”

Click on “OK”

Write ISN success

Click on “Read ISN” again

Confirm CGDI BMW key programmer write N13 ISN successfully

Except N13, CGDI Prog BMW also can read ISN for the following DME types without dismantling.

A0000015   B48 B58
A0000017   MSD80 / 81 /85 /87 MSV90
A0000018   N20 / N55 /B38


That’s all!