I’m trying to update Android on my Samsung GT-i5510. I’ve looked through tutorials, and under ‘settings’ and ‘about phone’ Software update does not seem to be there.
heres the link http://nguyenkieuhung1984.blogspot.ae/2012/02/odin-how-to-upgrade-samsung-galaxy-551_01.html do everything it says and your in 2.3.6 gingerbread :)
There are two official ways to update your android version; the way you mentioned (over-the-air) and using Kies (as Hovsep mentioned) or Kies Mini desktop application to update your phone using a pc. If Kies does not find any updates, then you are using the latest version for your phone (unless you have rooted your device).
have you tried connect to samsung kies, it should tell you if upgrade is supported.