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Error connect to stm32f4 "Can not read memory. Disable read out protection and retry"

Question asked by wayne.bruce.002 on Nov 11, 2015
Latest reply on Nov 12, 2015 by wayne.bruce.002
Hi everone, i have some problem with stm32f4 discovery. i use  STLink-utility , when i  try to connect to target, it always show "Can not read memory. Disable read out protection and retry". i was search in internet and it say that i should go to target->option byte -> read out protection level 0 , i was try and ST-Link Utility "Could not set option byte, please reset the target and retry".??? it mean pust reset button on stm32f4??? i did it but nothing, it still "Can not read memory. Disable read out protection and retry". Please help me 

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