I have a Blaupunkt car 300f stereo
Serial number GM030M23075294
Part number 7640852520

and i recently had to change the battery. After doing this the stereo now shows SAFE on the display. But i don't know the code to unlock the stereo, as the manual was lost be the previous owner. Hope someone can help me with letting me know the code to use.

Griffo, January 2011

Griffo
code 7474
leave it turned on untouched until it resets itself.
can thake few hours.
Code Entry as Follows:
Turn Off Stereo
Switch On Ignition (No Need To Start Engine)
Press & Hold Preset " AS " and
Switch Radio On - Display Shows
" SAFE " And Then Shows " 10 - - - - "
Press preset " 1 " repeatedly for 1st Digit
Press preset " 2 " repeatedly for 2nd Digit
Press preset " 3 " repeatedly for 3rd Digit
Press preset " 4 " repeatedly for 4th Digit
If the correct code number is now shown
Press & Hold Preset " AS " Until the Unit Beeps

hay88, January 2011

you could try www.decodemyradio.co.uk you might get a answer there,,

f, January 2011