Samsung Gear S (SM-R750A) Firmware Overview
What is the latest SM-R750A firmware?
R750AUCU2APC1, released May 3, 2016 with Android 2.2.1.4. It is a feature update on bootloader binary 2. The archive holds 3 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Gear S still getting updates?
Most likely not: there has been no new firmware since May 2016, so Android 2.2.1.4 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
Can I downgrade the SM-R750A firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 1 to 2:
- Binary 2 — since Mar 2016
- Binary 1 — since Feb 2015
A phone already on binary 2 rejects builds with a lower binary in Odin ("SW REV CHECK FAIL"), so it can go back to an earlier Android version only if that version has a binary 2 build. How to read a build number.
All SM-R750A firmware builds
How to Flash SM-R750A Firmware
Put the Samsung Gear S into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with Bit 2 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.