Installed theme can't manually change wallpaper??

wirelessly posted (mozilla/5.0 (iphone; cpu iphone os 5_0_1 mac os x) applewebkit/534.46 (khtml, gecko) version/5.1 mobile/9a405 safari/7534.48.3)

i'm trying change wallpaper in newly installed theme , it's not working. think it's kind of embedded in theme. how can change it?

 

could change through ifile don't know process it. need find theme overwrite default wallpaper has in folder.

 

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