
Samsung Gear Sport
Every official firmware build for SM-R600, newest first: one row per build with all regions (CSC) that received it.
Box codes of SM-R600 for different colors and markets. Firmware is chosen by the model code SM-R600 and your region (CSC), not by the SKU.

SM-R500

SM-R805W

SM-R630N

SM-R900N

SM-R815W
You can find the firmware on the model: SM-R600 page.
Yes, all firmware files for SM-R600 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-R600, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-R600.