[Galaxy Grand Duos i9082 Android Development] wiryawang:
Sorry for late reply on this.

Introduction :

Default Lockscreen Wallpaper files location are on this location :

Lock Screen Of Sim 1

/data/data/com.sec.android.gallery3d/lockscreen_wallpaper.jpg

/data/data/com.sec.android.gallery3d/lockscreen_wallpaper_ripple.jpg

Lock Screen Of Sim 2

/data/data/com.sec.android.gallery3d/lockscreen_wallpaper_2.jpg

/data/data/com.sec.android.gallery3d/lockscreen_wallpaper_ripple_2.jpg

After Note2 Gallery Mod :

Lock Screen Of Sim 1 (still same folder)

/data/data/com.sec.android.gallery3d/lockscreen_wallpaper.jpg

/data/data/com.sec.android.gallery3d/lockscreen_wallpaper_ripple.jpg

Lock Screen Of Sim 2 (different folder)

/data/data/com.sec.android.app.wallpaperchooser/files/lockscreen_wallpaper.jpg

/data/data/com.sec.android.app.wallpaperchooser/files/lockscreen_wallpaper2.jpg

After you flash Note2 Gallery Mod, SIM 2 lock screen wallpaper file which are : lockscreen_wallpaper_2.jpg & lockscreen_wallpaper_ripple_2.jpg will be disappear.

After that you can not change lock screen wallpaper of SIM 2 except using Samsung Stock Wallpaper or using live Wallpaper, in other words you can not change lock screen wallpaper of SIM 2 using image that you choose in Gallery.

Here's manual way to change SIM 2 Lock screen Wallpaper :

1. First of all, set a lock screen wallpaper to both SIM Lockscreen : Setting + Display + Wallpaper + Lock screen.

Choose from samsung stock Wallpaper, pick any picture you like, apply to both SIM, Choose All when asked.

You can see your both SIM using the same lock screen wallpaper.

2. Now go to SIM 1 & change the lock screen wallpaper of SIM 1 using the Wallpaper file that you want to use for lock screen wallpaper file on SIM 2

3. Install root explorer / root browser / ES File Explorer , etc if you don't have it yet on your phone. I Recommend ES File Explorer for better view and copy paste process.

3. Go to root folder (Choose "Device" if you are using ES File Explorer).

4. Go to /data/data/com.sec.android.gallery3d/ , you can see 2 files there which are lockscreen_wallpaper.jpg & lockscreen_wallpaper_ripple.jpg

5. Copy lockscreen_wallpaper_ripple.jpg file

6. Now Go to /data/data/com.sec.android.app.wallpaperchooser/files/

7. You can see SIM 2 lock Screen wallpaper files, which are : lockscreen_wallpaper.jpg & lockscreen_wallpaper2.jpg

8. Paste lockscreen_wallpaper_ripple.jpg file into /data/data/com.sec.android.app.wallpaperchooser/files/

9. Paste the file again for second time on this folder, you will be ask want to overwrite or rename the paste file, choose rename

10. Now you can see 4 files on this folder (lockscreen_wallpaper_ripple.jpg & lockscreen_wallpaper_ripple(1).jpg and lockscreen_wallpaper.jpg & lockscreen_wallpaper2.jpg)

11. Delete both file in this folder (lockscreen_wallpaper.jpg & lockscreen_wallpaper2.jpg)

12. Rename lockscreen_wallpaper_ripple.jpg file to lockscreen_wallpaper.jpg and lockscreen_wallpaper_ripple(1).jpg to lockscreen_wallpaper2.jpg

13. You are done, now check your Lock Screen Wallpaper of SIM 2, it should have change to your choosen wallpaper.

14. Now you can change SIM 1 lock screen wallpaper if you would like to change it to other image.

Sorry for the bad English and hope that you can diggest this Guide easily.