Problem in internal memory

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http://forum.xda-developers.com – I have GS1 for a while , now i get a strange problem !!! i can change ROM but if i take a pictures it will not be saved , and i cannot save any file to internal memory even after i format the internal memory (by phone or even PC) i found all my files, and no settings can saved and lot of other problems , some people told me that there is problem in lot of GS1 and some people use external SD to solve this problem ! is that right ? and if yes how ??? Thanks again (HowTos)