Samsung Galaxy Watch5
The latest firmware for Samsung Galaxy Watch5 (SM-R905N) is R905NKOS2DZG3 with Android 16, released on August 12, 2026 for 7 regions (CSC). Every official firmware build for SM-R905N, newest first: one row per build with all regions (CSC) that received it.
SM-R905N started on Android 13 and has received 2 major Android upgrades; it now runs Android 16. The newest build, R905NKOS2DZG3, was released on August 12, 2026. Over the last 12 months SM-R905N received 5 builds, spread over 5 different months.
Specifications of SM-R905F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-R540N

SM-R640N

SM-R630N

SM-R420N

SM-R530N

SM-R900N

SM-R910N

SM-R840N
The newest firmware for SM-R905N runs Android 16: build R905NKOS2DZG3, released on August 12, 2026.
The latest build for SM-R905N, R905NKOS2DZG3, was released on August 12, 2026 (2 months ago).
Over the last 12 months SM-R905N received 5 builds, with at least one new build in 5 different months.
Yes, all firmware files for SM-R905N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-R905N, 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-R905N.