I have the U-Bell DB1 with 171225. The unit I received always show the "storage status" as "No Memory Card" in the Hik-Connect and Uniden One apps. However, I can playback timeline videos but the individual alert playback buttons are gray with no function. Uniden support had me full format the SD card on my computer and "restore all" the U-Bell via the web GUI but no go. I even replaced the 8Gig card that came with the device with a Samsung 32Gig without improvement. Uniden is willing to fix it under warranty seeming convinced it is a problem with the SD slot. It's funny though that the unit is writing files to the card (verified on my computer) and I can playback the timeline even though their is "No Memory Card" according to the Hik-Connect and Uniden One apps on my iPhone. The IVMS-4500 app allows me to playback alarm videos.
I was wondering if anyone else experienced these phenomenon. I'm tempted to load Nelly's 180726 firmware to try to fix this but afraid it might void my warranty. The turn around time for the Uniden "fix" might be a month.
I also have this issue with my U-Bell, both on Hikvision, Nelly, and Uniden's own firmware. I also thought that the SD card slot was broken, but video is stored on it without any issues (funny thing, my doorbell actually came with a short clip of it being assembled in the factory! The worker must have hit the button on accident, you can see him applying the information sticker to the front).
I'm thinking it has something to do with the software on the phone..