[vectrac20tsri]

The security code starts at 3E8 and is 4 bytes long.

0x95 xor the first byte is the 1st digit of your security code.
0x3F xor the second byte is the 2nd digit of your security code.
0x4E xor the third byte is the  3rd digit of your security code.
0x6A xor the fourth byte is the 4th and final digit of your security code.

Late cd30s with usb and cd40s use the same algo just start at a different location 4E4.

Not sure how useful this is or if it has already been released but I have had soo much from the site just giving a tiny bit back.

My dad is currently breaking a astra h so If I can get any more modules I'll post the info on them as well.