Samsung S duos is dual SIM android ARmv7 ICS phone with 1 GHz processor. Though this device officially do not support Adobe flash player, it can be installed using below given Flash Player APK.
1. Download the ICS Flash player APL from here
2. Make sure you have enabled install from unknown source option under Device Administration in Settings> Security
3. Also make sure data traffic is enabled.
4. Once the apk is downloaded, install the same.
5. Now open the default browser and set plug ins to always on under Settings> Advanced> Enable Plug-ins > Always On
6. You are done. Now restart the browser and visit any pages such as YouTube or MetaCafe, and think you are in a desktop browser
Tip: Limiting the background process count to 4 will increase the performance in your phone. Do it here.. Phone Settings> Developer Options > Limit Background Processes.