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import usb.core
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import usb.core
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class ipoddfu:
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class ipoddfu:
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  def __init__(self, generation = 0, type = 0):
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  def __init__(self, generation = 0, type = 0):
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    try:
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    self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1220)
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      self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1220)
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    if self.dev and generation in [0, 2] and type in [0, 1]:
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      if self.dev and generation in [0, 2] and type in [0, 1]:
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      self.dev.set_configuration(1)
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        self.dev.set_configuration(1)
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      self.generation = 2;
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        self.generation = 2;
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      self.type = 1;
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        self.type = 1;
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      print("Connected to S5L8701 Bootrom DFU mode, USB version %s"  % self.dev.bcdDevice)
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        print("Connected to S5L8701 Bootrom DFU mode, USB version %s"  % self.dev.bcdDevice)
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      return
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        return
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    except usb.core.USBError: pass
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    try:
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    self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1240)
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      self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1240)
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    if self.dev and generation in [0, 2] and type in [0, 2]:
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      if self.dev and generation in [0, 2] and type in [0, 2]:
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      self.dev.set_configuration(1)
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        self.dev.set_configuration(1)
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      self.generation = 2;
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        self.generation = 2;
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      self.type = 2;
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        self.type = 2;
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      print("Connected to iPod Nano 2G NOR DFU mode, USB version %s"  % self.dev.bcdDevice)
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        print("Connected to iPod Nano 2G NOR DFU mode, USB version %s"  % self.dev.bcdDevice)
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      return
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        return
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    except usb.core.USBError: pass
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    try:
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    self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1223)
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      self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1223)
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    if self.dev and generation in [0, 3] and type in [0, 1]:
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      if self.dev and generation in [0, 3] and type in [0, 1]:
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      self.dev.set_configuration(1)
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        self.dev.set_configuration(1)
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      self.generation = 3;
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        self.generation = 3;
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      self.type = 1;
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        self.type = 1;
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      print("Connected to S5L8702 Bootrom DFU mode, USB version %s"  % self.dev.bcdDevice)
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        print("Connected to S5L8702 Bootrom DFU mode, USB version %s"  % self.dev.bcdDevice)
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      return
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        return
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    except usb.core.USBError: pass
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    try:
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    self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1242)
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      self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1242)
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    if self.dev and generation in [0, 3] and type in [0, 1]:
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      if self.dev and generation in [0, 3] and type in [0, 2]:
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      self.dev.set_configuration(1)
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        self.dev.set_configuration(1)
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      self.generation = 3;
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        self.generation = 3;
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      self.type = 2;
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        self.type = 2;
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      print("Connected to iPod Nano 3G WTF mode, USB version %s"  % self.dev.bcdDevice)
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        print("Connected to iPod Nano 3G WTF mode, USB version %s"  % self.dev.bcdDevice)
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      return
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        return
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    except usb.core.USBError: pass
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    try:
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    self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1225)
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      self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1225)
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    if self.dev and generation in [0, 4] and type in [0, 1]:
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      if self.dev and generation in [0, 4] and type in [0, 1]:
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      self.dev.set_configuration(1)
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        self.dev.set_configuration(1)
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      self.generation = 4;
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        self.generation = 4;
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      self.type = 1;
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        self.type = 1;
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      print("Connected to S5L8720 Bootrom DFU mode, USB version %s"  % self.dev.bcdDevice)
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        print("Connected to S5L8720 Bootrom DFU mode, USB version %s"  % self.dev.bcdDevice)
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      return
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        return
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    except usb.core.USBError: pass
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    try:
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    self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1243)
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      self.dev = usb.core.find(idVendor=0x05ac, idProduct=0x1243)
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    if self.dev and generation in [0, 4] and type in [0, 1]:
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      if self.dev and generation in [0, 4] and type in [0, 2]:
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      self.dev.set_configuration(1)
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        self.dev.set_configuration(1)
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      self.generation = 4;
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        self.generation = 4;
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      self.type = 2;
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        self.type = 2;
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      print("Connected to iPod Nano 4G WTF mode, USB version %s"  % self.dev.bcdDevice)
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        print("Connected to iPod Nano 4G WTF mode, USB version %s"  % self.dev.bcdDevice)
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      return
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        return
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    except usb.core.USBError: pass
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    raise Exception("Could not find specified DFU device (generation = %d, type = %d)" % (generation, type))
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    raise Exception("Could not find specified DFU device (generation = %d, type = %d)" % (generation, type))
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  @staticmethod
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  @staticmethod
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  def crc32(data):
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  def crc32(data):