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Could not 'erase sectors' for chip flash

Question asked by on Sep 18, 2017
Latest reply on Oct 13, 2017 by

Hello, when I use IAP in stm32f103vct6, sometimes some of them could not 'erase sectors' , and J-link could not 'erase sectors' to these board too. But I could use 'erase chip' to these board, and then  'erase sectors' could be used. Why and how to deal with it? How could i to aviod this happening?