For developers and advanced users, XDA often hosts stock firmware files mirrored from Samsung. Look for threads by trusted members like “adfree” or “hypochondriac.”
The safest and most common way to download firmware for the SM-R720 is through the official Samsung Gear/Galaxy Wearable app Connect the Gear S2 to your mobile device via Bluetooth. Samsung Gear app on your phone. Navigate to About Gear Update Gear software Download and install Samsung Gear S2 Sm-r720 Firmware Download