usb.core.USBError: [Errno None] Other error

[Shmadul]

I try to place my iPhone3,1 into pwned dfu mode and get this:

masons-mbp:ipwndfu shmadul$ ./ipwndfu -p
*** based on SHAtter exploit (segment overflow) by posixninja and pod2g ***
Found: CPID:8930 CPRV:20 CPFM:03 SCEP:01 BDID:00 ECID:000000D6360A7DAD IBFL:00 SRTG:[iBoot-574.4]
Traceback (most recent call last):
File "./ipwndfu", line 57, in
SHAtter.exploit()
File "/Users/shmadul/ipwndfu/SHAtter.py", line 45, in exploit
dfu.get_data(device, 0x2C000)
File "/Users/shmadul/ipwndfu/dfu.py", line 51, in get_data
ret = device.ctrl_transfer(0xA1, 2, 0, 0, part, 5000)
File "/Users/shmadul/ipwndfu/usb/core.py", line 1034, in ctrl_transfer
self._ctx.managed_claim_interface(self, interface_number)
File "/Users/shmadul/ipwndfu/usb/core.py", line 102, in wrapper
return f(self, *args, **kwargs)
File "/Users/shmadul/ipwndfu/usb/core.py", line 167, in managed_claim_interface
self.backend.claim_interface(self.handle, i)
File "/Users/shmadul/ipwndfu/usb/backend/libusb1.py", line 811, in claim_interface
_check(self.lib.libusb_claim_interface(dev_handle.handle, intf))
File "/Users/shmadul/ipwndfu/usb/backend/libusb1.py", line 595, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno None] Other error