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• A Blaupunkt New Jersey MP68 shows “BLOCKED” after six consecutive wrong code entries.
• FIRST ‑ make sure you have the correct 4-digit code.
• SECOND ‑ leave the set powered continuously (ignition key in ACC/ON, radio switched on) for up to 24 h. In many units the display will change from “BLOCKED” to “CODE” or “----” after the internal lock timer expires.
• If, after 24 h of uninterrupted power, the display still reads “THE RADIO IS BLOCKED!! PLEASE CONTACT SERVICE CENTER”, the counter is permanently latched in the EEPROM: the only cure is an authorised Blaupunkt/vehicle-dealer reset or specialist EEPROM re-programming.
Key points
– Obtain the correct code before you attempt anything.
– One uninterrupted waiting cycle is essential; switching the set off or interrupting battery power restarts the timer.
– Permanent block ⇒ dealer or qualified electronics technician (EEPROM job).
Lock-out mechanism (from the factory service & user manuals)
• Attempts 1-3: normal entry.
• Attempt 4: warning “2 TRIALS LEFT”.
• Attempt 5: warning “1 TRIAL LEFT”.
• Attempt 6: “THE RADIO IS BLOCKED!! …”.
The status flag and the attempt counter are stored in a 128-kbit serial EEPROM (M95128).
Two different “BLOCKED” situations encountered in the field
a) Temporary lock (only “BLOCKED” is displayed, no service message).
– Internally a timer (1 h→2 h→4 h… up to 24 h) counts down.
– After the countdown the set again shows “CODE/----”.
b) Permanent lock (long text message asking to contact service).
– EEPROM bit is set, no timer is running.
– Needs external equipment (Blaupunkt service tool or universal EEPROM programmer) to clear the counter and/or read the code dump.
Why contradictory information exists online
– Older Blaupunkt generations (Boston, London, Bremen, etc.) only implement the temporary lock; many forums quote those procedures.
– New-Jersey MP68 belongs to the later group that adds a hard block after the 6th error, as confirmed by the 2008-dated owner’s manual and several professional repair threads (Digital-Kaos, CarMasters).
• Independent code-by-serial-number services still cover most Blaupunkt models, but GDPR-type privacy rules in the EU force them to ask for proof of ownership.
• Chip-level resets are moving from 5-V SPI EEPROMs (M95128) to encrypted MCU flash in current head units, making DIY unlocks much harder.
• After-market radios now rely on immobiliser handshake with the car’s CAN bus instead of user‐entered PIN codes, reducing this kind of problem for new vehicles.
Technical timer principle:
\[ t{\text{wait},n}=2^{(n-1)} \text{ h} \quad (n=1,2,3,\dots) \]
where \(n\) is the number of lock cycles already incurred. For most MP68 units \(t{\text{wait},1}=1\text{ h}\) and is capped at 24 h.
Example workflow
• Bypassing the security code without proof of ownership may violate local anti-theft regulations.
• EEPROM manipulation voids any remaining warranty and, in some jurisdictions, is considered tampering with a certified anti-theft device.
• Personal data: if you send an EEPROM dump to an online decoder, you implicitly share the unit ID; use reputable providers.
Implementation best practice
– Have the correct code ready before the wait period ends; one wrong entry restarts the whole cycle.
– Use a memory-saving device if you must disconnect the vehicle battery for other repairs; this prevents code-prompt situations.
– If you choose the EEPROM route:
• Identify 8-pin SOIC M95128 (sometimes labelled “128W”).
• Use SOIC-clip or hot-air removal, read dump, clear address 0x1F0-0x1FF (counter) and reprogram.
• Reassemble and test on the bench before refitting.
Potential challenges & remedies
– Weak battery → connect a charger or bench PSU.
– Power dropouts (door locking, remote start) reset the timer → keep the car untouched.
– Code unknown → dealer can access Blaupunkt central database via radio part number (7 648 xxx xxx) + serial (“BP” followed by 14 digits).
• Not all MP68 firmware revisions behave identically; a minority of early units reset after 24 h regardless of message wording.
• Continuous 24 h waiting is sometimes impractical; a bench power supply is recommended.
• Replacement of the head unit may be cheaper than professional EEPROM work for older vehicles.
• Study Blaupunkt service bulletin “Anti-Theft SAF/548-MP68” which details the EEPROM address map.
• Explore CAN-based immobiliser pairing used in current OE radios as a more robust anti-theft alternative.
• Investigate open-source EEPROM-reading tools (e.g., Flashrom with CH341A) applicable to automotive head units.
A “BLOCKED” Blaupunkt New Jersey MP68 can often be revived by keeping it powered on, untouched, for up to 24 h, after which it will again accept the correct 4-digit code. If the display still shows the full “PLEASE CONTACT SERVICE CENTER” message after a continuous 24-h wait, the set is in a hard lock-out stored in its M95128 EEPROM; only an authorised Blaupunkt service technician or a specialist capable of EEPROM re-programming can clear it. Always confirm you have the right code first and maintain an uninterrupted power supply during the waiting period to avoid lengthening the lock-out.
