Update on my SpyPoint CS experience just today: talked with a representative pretty quickly, within 5 mins or so of being on hold, which was great. They did some simple troubleshooting with just trying new batteries and cycling on/off. Without any difficult they said they will replace this Flex camera for me. Generally pleased with the customer service. That said, this is the second camera to be replaced. When you dial Spypoint CS, they have a specific extension for dealing with Flex camera calls. I would assume they get a lot of calls with issues. Both cameras being replaced ultimately had the same issue. They would turn on with flashing status and signal lights, but no lights on the battery even with fresh batteries.
The Flex cam I had go down yesterday/weekend was seemingly killed by the firmware update. I have no explanation on why but it was working fine last week, and at least transmitting some new detections and the repeat old pictures. This particular camera was even working during a "test" preformed while on the phone with CS last week when troubleshooting a different Flex. Although the app showed the camera batteries were dead and offline, the batteries tested fine with a full charge. So, still confused on why it stopped working altogether after the update.
I have two Flex cameras still in the field that seem to be working. They transmitted a couple images of some deer yesterday, but again, quality was pretty poor (difficult to see details like antlers vs no antlers at 25-30 yds in good lighting). I will be seriously considering listing the new replacement Flex cameras on the classifieds when they arrive.