My Cell-Links are being used in two Truth cams and one Spypoint Solar Dark. They do recommend setting the cam to 30sec or 1min intervals, but I have the Truth cams set to 10 secs and the Solar Dark to instant. You want to set your cam to low resolution and make sure the micro SD card is a Class 10, not a Class 4. My Cell-Links were working before installing the firmware update, but I went ahead and updated them anyways. You also want to do a full format on the card, even if it's new, and I make sure to always fully format a card before inserting it. You can do the full format, then install the files for the update. Make sure to a full format of the SD card dongle as well.
Lastly, turn the Cell-Link on first and wait until it goes through the signal search and the light goes off, then turn on your trail cam.
Ironically I shot a buck Friday evening. My Cell-Link showed he was in an island of woods where we have a pond, Wednesday early afternoon, and again at 6pm, walking by the cam to exit the woods to enter a picked bean field. I didn't get any photos of him Thursday or Friday morning, but the cam was still set to transmit twice a day. I decided to hunt that stand Friday evening, since the wind was right, and at 6pm I got a photo sent, showing he was at the pond at 12:30pm. I had a feeling he was in there, and he did step out at 6:30pm. I even got two pics of him going by the cam again after I shot and he took the same trail back into the island of woods.