bootprog.py output

gistfile1.txt

python2.7 bootprog.py -d /dev/cu.usbserial-FJ000036B ~/projects/libopencm3/libopencm3-git/examples/stm32/f1/stm32-h103/fancyblink/fancyblink.bin
STM32 SystemMemory Production Programmer -- version 1.1
Copyright (C) 2011  Black Sphere Technologies
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

Target bootloader version: 2.4

Removing device protection...
Traceback (most recent call last):
  File "bootprog.py", line 169, in <module>
    boot.read_unprotect()
  File "bootprog.py", line 129, in read_unprotect
    self._sync()
  File "bootprog.py", line 39, in _sync
    self._checkack()
  File "bootprog.py", line 58, in _checkack
    if b != ACK: raise Exception("Invalid ack: %r" % b)
Exception: Invalid ack: '\x00'