Bootloader seems to not erase?

[ghost]

I am trying to flash customised 7.1 rom. When I use --destroy to erase bootloader before flashing everything seems fine message says: "it is erased nothing to do more". Whole flashing process goes without error. However when device resets it stays stuck on powerup logo (when I issue command --destroy in this state (still connected to device) it again says it was successfull, powerup logo disappears to black screen and it seems like bootloader was erased. However rom never boots. I used the same command few days ago and rom booted. I haven't changed the rom since, it stays on external drive. But I can successfully flash other rom (6.0). I don't know what the problem is it seems that the bootloader of 6.0 rom is never erased and stays behind even though the tool says it was erased. Is it possible? I always first --destroy than flash with "all parts, --wipe". What can I do?