FORGOT PASSCODE ON JENSEN VM9022HDN - Jensen VM9510 Car DVD Player

I would just take it to a instore mobile phone repair man/or lady usually chinese are great at what they do not expensive .

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled Follow these steps if you've forgotten your passcode, or if a message says that your device is disabled.
Forgot passcode for your iPhone iPad or iPod touch or your device is...

When you disconnect your battery and then reconnect it again, it disables the radio. This is an anti-theft protection for your car radio.
The enable your radio the activation code is in your vehicle owner's manual. If you do not have this code you need to go to your vehicle manufacturer's service centre and get them to enter this code for you.

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The default passcode is 0000 or 00000 or 00000000

I took my radio out of the car I sold and tried to put it my other car and it keeps saying enter entry code, its a jensen vm5912 whats the problem.

Jensen VM9512 Factory code is: 012345.

Try entering the default Jensen passcode "012345". It may sound silly, but it'll work if the owner hasn't changed the password to their own personal code.