On Mac OS X 10.11 El Capitan, this works for me for BlackIce-1
(I have also checked Window 7. My VMWare Player Ubuntu that is good for IceStick on FTDI chip, fails to attach to BlackIce-1 with its CHM340.)
Mac OS X 10.11 successful firmware flash:
brew install dfu-util
dfu-util -a 0 -d 0483:df11 -s 0x8000000 -D ./target/blackice/iceboot/iceboot.raw -t 1024
I applied the dfu-util patches, but no improvement, give it 5 tries if it errors out.
Update the CH340 driver for El Capitan
BlackIce found at /dev/tty.wchusbserial1a20
picocom -b 115200 /dev/tty.wchusbserial1a20 --imap lfcrlf,crcrlf --omap delbs,crlf --send-cmd "ascii-xfr -s -l 50 -n"
Again, this is for BlackIce-1 on Mac OS X 10.11, but I hope it helps you still.