If your radio says "SAFE 2", you must leave the radio turned on for one hour in the "SAFE" state before you can try entering the code again. Do not disconnect the power, or the timer resets.
The screen will initially display "SAFE". After roughly 3 to 5 seconds, the display will automatically change to show "1000" . This indicates the system is ready for input. rcd 300 code calculator blaupunkt 1 new