one problem - bootloader is burn properly, blink sketch is burn properly but when I try to upload new sketch something happens and second arduino is bricked till next bootloader burning.
This could be the result of incorrect fuse settings. If you fail to enable the bootloader section, the Arduino will start at flash location zero instead of at the start of the bootloader. When the chip is otherwise blank, location zero through "start of bootloader" contain an irrelevant instruction, and the bootloader will eventually start and appear to run normally. After you've downloader a sketch, though, you'll have "real code" between zero and the bootloader, and the bootloader won't get control.