Sd Card Uupd.bin [best] -

In plain English, when a device (like a dashcam or a GPS) needs to update its internal operating system, it doesn't connect to the internet the way a smartphone does. Instead, it relies on the SD card as a physical medium to transfer the update. The manufacturer provides the uupd.bin file, you copy it to the SD card, insert it into the device, and the device flashes (installs) the new firmware.