Thread: Garmin Maps expiration Date

Originally Posted by aktroller

Turns out that holding the power button is all that is needed to enter that mode.

This way of entering the Boot Block mode has long been known.

Now we would like to know how to enter the Master Reset mode on the touchscreen GPSMAP 74xx/76xx series ...

I was unable to find any to make the rollback happen. It goes through the motions, but version 11 refuses to give up it's hold. Very discouraging! I can get by with a laptop running my homemade charts, but I shouldn't have to. Garmin's Quickdraw contours simply won't work here as we have as much as 23 feet of tidal change. One foot contours won't cut it either. Looks like Simrad or Furuno in my future.

Have you read my [Only registered and activated users can see links. ] here?
Pay attention to the 'updates' folder! And also see the Note there.

Once again, thanks for the information. I read the posts and their individual links and tried to copy those techniques as much as possible.
I ran GPSMAPSerieswithSDCard_20170825.exe which placed GUPDATE.gcd and the folder “updates” on a blank card. I placed it in the machine and held the power button down until “Transferring to Recovery Region” appeared. I released the power on button at this point. After 15 or 20 seconds, the machine started the update process which still ended with software version 11 still installed.
I noticed in message #11 that GUPDATE.gcd is the only file that should be on the card, no “updates” folder. I tried this, but nothing would happen until the “updates” directory was returned.
Also, I’m wondering if running GPSMAPSerieswithSDCard_20170825.exe is what I’m supposed to be doing. I’m getting the impression that files are supposed to be extracted from the executable which is probably way beyond my skill set.
Thanks again!

Originally Posted by aktroller

I noticed in message #11 that GUPDATE.gcd is the only file that should be on the card, no “updates” folder.

This applies to legacy devices. The firmware update for your 7612 is in the 'updates' folder.

Originally Posted by aktroller

I’m getting the impression that files are supposed to be extracted from the executable which is probably way beyond my skill set.

You can extract those files from the executable using a regular WinRAR, but this will be the same.


Before starting the downgrade, make sure that there is no GarminDevice.xml in the Garmin directory of your Update SD Card. Starting with the unit powered off, insert the Card. Press and hold the power button ...

I've followed your instructions to the letter, but the present software refuses to give up the ghost . Is it possible that when running the executable that it's checking my computer for Garmin information? I do have Homeport and Mapsource installed. Has anyone been able to rollback a 7600 series? I'll try making a new SD installation card from a computer with zero Garmin data. I appreciate your not giving up on this problem!

Spoiler: large image

[Only registered and activated users can see links. ]

Tried this morning with a SD card created on a computer with no Garmin info. Same result - no joy.

Originally Posted by aktroller

Tried this morning with a SD card created on a computer with no Garmin info. Same result - no joy.

What about Slot 2 during this procedure?

Note:

• Insert your Update SD Card into Slot 1 of the switched off device
• Remove any SD Card inserted in Slot 2 (if present)

Slot 2 has been empty in all previous attempts. Tried this morning using slot 2 with slot 1 empty. In spite of various combinations of holding the power button and pushing on the screen, the results were the same - no change.

Downloaded it again. All the same size. Has anyone been successful with a 7400 - 7600 series?