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flip locking flap on connector away from the gold pins. Slide the ribbon cable into the connector on the side with the gold pins as far as it will go. The ribbon goes face down with its gold pins facing down. Then using two fingers flip the locking flap down and toward the ribbon cable. It should click. Be careful, if you snap the flap it is game over.
However, Garmin released 3.4 which will include the changes in 3.1 and also makes the bluetooth compatible with more phones.
You need to go to www.garmin.com and download their webupdater and run it with your Nuvi connected to the PC with a USB cable. It will check (via the Internet) if you need a firmware upgrade. The latest firmware version for a Nuvi 660 is v4.7. There is a second menu after the main firmware option that allows you to select additional software. Select yes and check the bluetooth 3.4 box and the Chipset "G" box if it's shown.. The Chipset "G" is the upgrade for the receiver in the flip-up antenna. Let it download. When finished, select to safely remove the Nuvi. You can now unplug the USB cable. Your Nuvi will reboot and load in the new changes. Whatever you do, don't turn your nuvi off! Let it go and update. You will see it say "Loader", then "Loading Software" and you'll see a task bar that says "Updating Bluetooth Software" and "Updating GPS Software" (if required). Once you get to the main menu and there are no more texts coming up on the screen. Press the power button and turn your unit off and then back on again. Check the GPS and Bluetooth firmware versions in your Nuvi. It should be 3.0 for the GPS and 3.4 for the Bluetooth. Check the firmware version if you selected v4.7. You will have to re-pair your phone with your Nuvi as the update erases any previous set-up. Let me know how it went for you. If you have trouble with this, let me know. I can do it for you. I have done it many times. Please rate my solution if you found it helpful.
To charge a nuvi, use one of the following methods:
Connect the nuvi to the suction cup mount and the vehicle power cable.
Connect the USB cable to the nuvi and the computer. The computer will charge the nuvi as long as the computer is on. However, the unit will be in Mass Storage Mode and normal operation is not possible.
Connect the AC power cable and the nuvi to a wall outlet.
Please note: All of the nuvi series will come with a suction cup mount and vehicle power cable to charge the nuvi. However, only some of the nuvi models will come with an AC power cable and/or USB cable. If they did not come with the nuvi, they would be optional cables and would be a separate purchase. Garmin only recommends using an AC power charge that is purchased from Garmin. Third party power cables may not charge the nuvi. These cables may be purchased from Garmin or Garmin's dealers.
The ribbon cables are clameped in place. The look like they would slide out from the connector if you pulled then hard enough,... you do NOT want to do that. The black portion of the connector is actually a hinged clamp. With the unit lying on a table, face up as it you were using it; lift the top screen half away for the bottom half and tilt it toward yourself. You should see the ribbon cable and the red & blk wires. For the wide center connector and the one on the right, the black piece hinges up an away from you (towards the top). Try the one on the right first. When you flip it up, the ribbon will pretty much fall out. Pry the wide center one on the ends, NOT in the center. The narrow one on the left tilts donw towrds you. For the antenna, the hinged peice is brown, and it flips up towards the right. This one does not just fall out. It needs some gentle wiggeling. Also, I was able to use a T6 torx, T5 seemed a little loose,... yo don't want to strip any screws or you'll be screwed. SpaceVector