Garmin 550 lost safemode and garminlock on settings screen GPS still thereon normal all other screens seem ok how do I restore those two choices afraid if not at home base unit will not turn on

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:

1. Start with the device OFF and unplugged from power
2. Touch and hold the lower right corner of the screen with an index finger or the eraser end of a pencil
3. Continue touching and holding the lower right hand corner of the screen then power the device ON
4. Release the power button when the device powers ON
5. You will see a new message: "Do you really want to erase all user data?"
6. Remove your finger from the touch screen when this message displays
7. Touch Yes
   • If text language is not in English, this is the button on the right

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.

Contact Garmin Customer support: on their web-page, or: 1 (913) 397-8200. They are very helpful.

Hello

Visit the garmin website and order for a new screen online,you will have to send your nuvi over to them to fix for you at a particular fee

1:Turn the Nuvi on.

2:Touch the tools icon on the main screen. The tools icon is represented by a wrench surrounded by a blue circle.


3:Touch the "Settings" icon which appears as a wrench.

4:Push the "Restore" button at the bottom of the screen. A confirmation message will appear asking to confirm restoring the Nuvi to factory settings. Push yes to restore the factory settings
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Try this for hard reset .

Turn off Garmin device. Press down on bottom right corner of the touchscreen [ Don't let go ] , and then power on the GPS unit. You should be prompted whether do you really want to erase all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.

PLEASE DON'T FORGET TO RATE !

Hello :

It seems that you have a software problem with your NUVI . You need to reset it to solve the problem .


1:Turn the Nuvi on.

2:Touch the tools icon on the main screen. The tools icon is represented by a wrench surrounded by a blue circle.


3:Touch the "Settings" icon which appears as a wrench.

4:Push the "Restore" button at the bottom of the screen. A confirmation message will appear asking to confirm restoring the Nuvi to factory settings. Push yes to restore the factory settings
............................................................................................
Try this for hard reset .

Turn off Garmin device. Press down on bottom right corner of the touchscreen [ Don't let go ] , and then power on the GPS unit. You should be prompted whether do you really want to erase all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.


PLEASE DON'T FORGET TO RATE !

there is a screen that give you the choice of which detail is shown in the unit, touch the left corner of screen the the map is displayed that should bring up the options, if not is try reset by holding down finger on bottom right hand corner of screen before you power up, and go to www.garmin.com for software update

Take the battery out

"If your Quest locks up....on rare occasions, your Quest may freeze or lock up. In this case, reset the Quest by pressing the unit's Power key and the IN key at the same time. This will turn off your Quest. The unit will operate normally when you turn it on again."

I am sending it in for warranty repair.

Ok, a couple of stupid questions here - it sounds like you have posted this before. If so, I did not see the post or responses, so forgive me if I repeat anything. At the bottom of that screen it should say Restore. Does it, and have you pressed this? Also, have you tried resetting the unit either with the reset button or using the master reset? What happened?