[rurbam]

I've updated my L520 to Lumia Amber and successfully but no equalizer in Audio setting only shown enhancements > Flip to silence, can anybody explain this? Did L520 can be upgraded to GDR?

[WanderingTraveler]

There should be an equalizer, have you tried updating the audio app or inserting earphones?

And, no, the Lumia 520 cannot be updated to have DDR3 memory.
If you mean GDR3, wait for Black, or sign up for the dev preview.

[Nokia Boy]

First of all the phone is called Nokia Lumia 520 and the update is called Amber.And since the phone doesn't have dolby sound enchancement,there is no equaliser...
You can only use the developer preview of GDR3 update (not DDR3),If you wait a few weeks or so,Black update will come and will include GDR3's content too..
P.S. Welcome to WPCentral :)

[rurbam]

I had difficulty getting the upgrade via the Dev Preview, when the official version GDR3 for Lumia 520 available?

[rurbam]

First of all the phone is called Nokia Lumia 520 and the update is called Amber.And since the phone doesn't have dolby sound enchancement,there is no equaliser...
You can only use the developer preview of GDR3 update (not DDR3),If you wait a few weeks or so,Black update will come and will include GDR3's content too..
P.S. Welcome to WPCentral :)

yes I mean GDR3 not DDR3, sorry

[Nokia Boy]

Here you can see the availability the update about each phone and carrier:
Availability in Asia Pacific - Nokia
520 have not yet received the update,and since it's the least powerful one,it will receive the update last i think...