How can I clear or reset the pin number
Garmin has official steps for your model. Pasted below along with Garmin official link:
https://www.mapsupdates.org/blog/garmin-nuvi-map-update/
Step 1 - Turn on the GPS. Enter the PIN code if you remember. If not, raise the GPS antenna so that the device can acquire a satellite signal and drive to the safety location you have programmed when first setting up the device. Driving to the security location will unlock the GPS in you do not remember your PIN.
Step 2 - Tap the "Settings" icon on the touch screen, then select the "System" menu.
Step 3 - Press the restore button, which is located at or near the bottom of the "System" menu. Confirm your selection by pressing "OK" when asked.
Step 4 - Push the optional touch screen for "Garmin Lock" once the system has rebooted. Confirm your selection by pressing "DEACCORD."
Step 5 - Enter your new PIN. You will have to enter twice, so that the second is the first . After entering and confirming your PIN a second time, touch "YES" to confirm that you want to make your new PIN.
Step 6 - Reset the security location when prompted by touching "ACCESS." Drive to the security location of your choice and lock it in memory by pressing the "Set" button. Your PIN has been reset. Hopefully your Garmin NUVI pin will be re set as of now.
If you do not have any idea where the safely location is then I would say you should instead follow the instructions to wipe the device to factory settings, as follows:
Note: A master reset will erase all favorites1 and will restore your device to the default factory settings. If you would like to back up your favorites to your computer, you can find instructions to do so here.
To perform a master reset on a nuvi 200, 205, 405, 500, 600, 700, 705, 1100, 1200, 1300, 1400 series, 1690, 1695, 2300 LIVE series, zumo 220, 450, 550, 660, and 665:
The device will now reset. Follow the on-screen prompts and then place your device in an area with a clear view of the sky until it acquires satellites.
1Although the master reset will erase all saved favorites, any loaded custom points of interest will remain intact on the device.
SOURCE: garmin nuvi 650 unlocking
If you are the legitimate owner, you can send your unit back to Garmin to be unlocked. Be prepared to provide rock-solid proof of ownership because Garmin has a program that prevents stolen units from ever working again. It's one of the reasons that I purchased it. As word gets out that you cannot unlock a stolen unit, thieves will be deterred from stealing them in the first place. And if you try to open the unit to see if there is any easy jumper or something, you will permanently destroy it.
SOURCE: how to reset my gps device
Steps to fully reseting Your Garmin nuvi
1:remove sticker located at bottom
2. There should be a reset button located to the far right.
3. Hold down the reset button ( at the same time push the power button to the left) hold these for 10 seconds.
SOURCE: I do not remember my code to unlock garmin nuvi
You have to take your unit back to your Safe Location where you set your PIN number (usually your home). Otherwise, you'll have to send it to Garmin with the receipt to have it reset.
SOURCE: i bought a used garmin nuvi and it is pin locked
Unfortunately, even if you perform master reset on Garmin GPS unit, it does not reset Garmin Lock security feature, which password-protect most Garmin electronic devices to deter theft. If you forget the PIN or password unlock code to unlock the Garmin unit, the best solution is to bring it to Garmin to get unlocked. “Secure Location” does not unlock a locked Garmin unit either as it’s only a temporary fix as when it’s turn on outside the security location, the device is locked again."
So unfortunately, there is only one option: You have to send your nüvi into the Garmin, who can unlock it. Remember original receipt.
SOURCE: Garmin Nuvi 200
If you're good with the soldering/heat gun you can purchase a broken unit online and just swap all the IC's...
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