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  here is my problem with that phone it use java MIDP 2.0 and it was working good with installing apps and games and after i try to install dictionary all things gone bad now when i install a java games or any kind of java programs on v770 my cellphone automatic turn into black and after a second the installation process will stop but i still use the phone and its working fine except installing apps or games its
  hangs and then after a second it start normally !!
  what is the problem???? could anyone help me

problem solved Reset code : *#73738#