Is it possible to use a sdcard with the exFat
on the Galaxy Grand Duos GT-I9082 ? Is it possible without a custom ROM ?
I am running Jellybean 4.2.2 on the stock ROM. I can upgrade to kikat on a non-stock ROM.
Yes, if you upgrade to KitKat ( that's the minimum Android version that supports exfat as explained here Since which Android version is exFat supported? )
Your phone supports SDXC as listed here ( presumably on KitKat or higher )
SDXC is backward compatible to exfat as mentioned here so it should support, unless there is something I am missing
You can also use this app exfat checker to verify if your current configuration supports exfat