Diagnosis
The camera is stuck in a boot loop or firmware update process. The sync/status LED should pulse blue briefly during setup, not spin continuously.
How to Fix It
First, hold the reset button on the camera for 15 seconds. The LED will flash amber. Release. Wait 5 minutes for a full reboot. If the blue spin continues, try a different 5V 1A USB power adapter and cable. Plug directly into a wall outlet, not a USB hub.
If That Didn't Work
The firmware may be corrupted. Use the Arlo Secure app to remove the camera from your devices. After removal, factory reset again (15-second button hold). Re-add the camera as a new device.
Heads Up
A continuously spinning blue LED can indicate a failing internal memory chip. If resetting and re-adding fails repeatedly, the camera hardware is likely defective.