Ernesto, for your information:
1. Download and Install python(x,y), use google for download link
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
2. Open program and select in Applications "IPython QT console" and click the green checkmark to run it.
3. In the console window that open, cut and paste the following code line by line (press enter after you paste each line), change XX for your second serial number, you can get it from the IDENTITY.TXT file (the soft has option to generate it):
from Crypto.Cipher import ARC2
import struct
serial = 111264
serial2 = XX
option = 29
record = struct.pack("<II", serial, serial2 + (option <<20))
encyphered = ARC2.new("Revision\0").encrypt(record)
print encyphered.encode("hex").upper()
4. Note the resulting code on paper.
5. In the CMU200 exit from program to MSDOS(Alt-F4) and go to the location of SWOPT.DAT file, i don't remember, you will need a keyboard
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
.
6. Make a backup of file (I always make a backup of entire disk before make modifications).
7. Use the MSDOS edit command with the file and put the code at end of file. Save the file.
8. Restart the equipment.
It's very easy, right?
By the way, I think it is possible to enter the code directly in the program as an option of system menu.
Regards
Manuel