I installed JellyBean on my Samsung Galaxy Y Duos, but now I want to go back to Gingerbread 2.3.6, how can I do that?
Asked For Samsung Galaxy Y Duos GT-S6102
better luck here perhaps
[Stock][ROM][Odin] Galaxy Y Duos S6102 flashable firmware packages
How to Flash and Install Stock ROM/Firmware on Samsung Galaxy Y Duos
you need your mobile firmware otherwise you get troubles and perhaps your phone will never work again!
How to revert to Gingerbread from ICS
[HOW TO] Odin any stock rom