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Yeah the firmware will be a little different for single and dual SIM variants but not drastically different. Only change would be an extra modem st file in the dual SIM variant along with the options in the settings menu. I have seen several people flashing single sim firmware on dual SIM phone and vice versa.
About volte support, Indian firmware should have it. Below are the easiest steps I found.
1. Download the Indian firmware for your phone from sammobile.com
2.Download Odin, latest version (search in xda)
3.Install Smart Switch and take a full backup on your pc/sd card. Your apps gets backed up too.
4. Flash Indian firmware using odin
5. After boot up, check for an update. Download and install.
6. Put on airplane mode and then restart.
7. Volte should appear
About volte support, Indian firmware should have it. Below are the easiest steps I found.
1. Download the Indian firmware for your phone from sammobile.com
2.Download Odin, latest version (search in xda)
3.Install Smart Switch and take a full backup on your pc/sd card. Your apps gets backed up too.
4. Flash Indian firmware using odin
5. After boot up, check for an update. Download and install.
6. Put on airplane mode and then restart.
7. Volte should appear
