How to make a Release configuration? SOLVED.
Thanks Tarek for digging into my problem and helping me out. And also for teaching how to use STM32 ST-Link Utility program 
The reason of such behavior was my Programming/Debug interface board where FTDI chip has one of its IO pins connected to the Boot0 input. That IO was in ‘1’ state all the time. I’ve changed that pin to ‘0’ and now the board starts without problem in standalone mode after pressing reset button.
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