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ST-Link utility doesn't program a byte at the end of memory

Question asked by k.r.001 on Jul 3, 2012
Latest reply on Jul 5, 2012 by k.r.001
I've just purchased ST-Link/2 programmer and installed ST-Link Utility v.2.3.0.
I load intel hex file which contains 0x55, 0xAA at adressess 0x0800FFFE and 0x0800FFFF respectively. The device is STM32F103C8T6.  However, after programming only 0x55 byte is programmed. Instead of 0xAA byte the flash memory contains 0xFF. Addictionally, in the main window of ST-Link utility i can't see a byte value at address 0x0800FFFF.
 Why is that ???