SM-G900H is different from other Galaxy S5 variants. SM-G900H uses the Samsung Exynos5 CPU, others use the Qualcomm MSM8974 CPU.
No root needed, just install Boldbeast Recorder and go, your SM-G900H records calls perfectly in two sides.
Please use these settings to record calls:
- Record Mode: 4
- Tune Audio Effect: No
- Tune Audio Route: No
- Tune Samsung1: No
- Tune Samsung2: No
- Tune Samsung3: No
All Android versions (currently Android 4.4 and 5.0) work very well.