here follows the reply what i got from samsung on the software upgrade.
Dear Mr. Devesh
Thank you for taking out time and sending this email to Samsung.
We can understand your concern regarding the unavailability of a firmware update for your Samsung handset GT-I8552 (Galaxy grand Quattro). We sincerely regret the inconvenience caused to you.
We would like to inform you that feedback to release a firmware update for GT-I8552 has already been sent to our department concerned. They are in the process of developing the same; however, as of now there is no official release date available with us. So kindly stay with us till then.
Also, your Samsung handset comes with a feature which will automatically inform you about any new firmware release provided it’s connected to Internet. You may enable that option by following the steps mentioned below:
From the home screen, select Application> Setting > about device > Update (check for update) or select Application> Setting > more> about device > Update (check for update)
You are our valued customer and we appreciate your patience in this regard.
Technical Support Team
Samsung India Electronics Pvt. Ltd.
You can Chat Live or find troubleshooting guides on our Website: www.samsung.com/in/support
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