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Which radios fitted to Porsche can have their unlock code recovered through serial number? - CR-220/CDR-220 - Becker - CR-210/CDR-210 - Becker - Traffic Pro NAV/CD - Becker Which radios can not have their unlock code recovered through serial number? - CR1 - Alpine - CDR-23/24 (or later) - Becker - PCM (Porsche Communication Management) – Siemens & Becker How to get your radio serial number? CR-220/CDR-220: Hold down the TP button for at least 10 seconds after you turn the radio on. "Becker 1" will be displayed. Rotate the right knob (slowly) and it will display th