1

No root needed, just install Boldbeast Call Recorder V7.2 or newer versions, and

- set all settings to default.
- use Record Mode 5 to record calls.

Now your Galaxy Star Duos GT-S5282 records calls perfectly in two directions.

2

Updated 2015-01-04
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If the caller's voice is weak in recorded files of incoming calls, please set all options in the app to default settings, then everything will be OK.