Is your Psoc Programmer at the right Rev. I think you need to reload the bootloader program into the 5lp device.
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Perhaps you have recently updated the software for Kitprog.
If the LED (LED3) gently pulsing it is Mass Storage mode.
Press and hold the RST button (SW3) at Kitprog for 5 seconds to exit Mass Storage mode.
Thank you bobgoar. it was the bootloader problem and after installing new one it works fine. Thank you pavleon.