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problem with USART bootloader programming STM32F407

Question asked by ml.michal on Jun 28, 2013
Latest reply on Jun 29, 2013 by ml.michal
Hi all, 

please could you help me to identify changes in communication using serial port and STM32 bootloader, 
i'm able to program STM32F103 with version 2.2 chip ID 414 but i can't program STM32F407 with bootloader version 3.1 chip ID 413, 

i'm getting NACK on command 0x73 - write unprotect  :-( 

what should i change to get ACK ? 
there are no Flash or Read-out protections activated, 

Kind regards,