please find below a short tutorial..pm me if u need more help
Normally Blaupunkt serial numbers have a letter as the 5th character
after the BP. However, in some cases, this is replaced with a number, e.g.
BP63181. In this case you would ignore the 5th digit. An example would be
S/N BP631812345678, the number you would use is 3182345678.
A 1
A Last 10 Digits of Serial Number
B As A but +2 to last digit of code
If the radio you are decoding has a code that begins with a 0 or a 1 and the code you get is higher, try using the
next algorithm up. eg. ALG1 becomes ALG2 and ALG3 becomes ALG4.
With option C, the part No. is the one that starts with 76. eg. 7642852391. In this case you would use 852. The easiest way to remember is to ignore the first character and the use the middle 3 digits.
C Mid 3 of Part No. + Last 7 Digits of S/N