XPROG-M Programmer Read MCU of Old MB Keys Experience

I have bought a China Xprog-m v5.50 to read out the CPU of the old Mercedes Benz Keys. So i have connected the adapter according to the diagram and installed the programme, but when I´m trying to read out the Cpu there is always “Device is silent. Timeout error“. First the green LED is on for a moment, and then turn red.


Then i changed it into com port 1 (com port 29 at the beginning )

Soldered the cables to the adapter for the chip…a external 9v cable

On 1 and 28 is + and –

xprog-m-problem (1)

xprog-m-problem (3)

xprog-m-problem (2)

But still the problem: Device is silent. Timeout error.


Someone said, “1 foot orange,raise. Oscilator setting automatic setting 2mgh.” (i tried but not worked)

Another tip i got from mhhauto and tried:

“1- Don’t use any adapter, read the MCU in key.
2- Lift(desolder from key) pin 1
3 – Match the frequency with key crystal (Usualy 2Mhz but sometimes 4Mhz)
4 – select MC68HC05E6(0F82B)
5 – pin out MCU with xprog:



Ps. USB cable.No need for external power supplies.


You can use UPA USB programmer instead xprog, need connect one more wire but it’s more stable.”

So I have soldered the MCU on the Key back, and this time luckily, it works fine.

However, another problem!! I could read it out and save the .bin, but icannot choose “erase” the file to make the key blank to put a other .bin on the key. 

xprog-m-problem (4)
One solution i found in web is to write the new dump in key without erase.

Yes, it did!!! It works when i put new dump without erase now.

But first i have tried to put everywhere 00 00 (zeros) and write to MCU, and this works, but when i have tried to write via IR with myak500 key programmer it doesn’t work.

So i have done via MCU with xprog and it works.


But it would be interesting, why ak500 don’t work with this key. I first wanted to read out the blank key, but doesn’t work. Usually when I’m erasing NEC keys and read it out there is “blank key” and i can write it without any problems.