What? (archlinux intel, iphone 5s 12.5.7, iPhone6,2)

[prgcadd]

error: Traceback (most recent call last):
File "ipwndfu", line 68, in
checkm8.exploit()
File "/home/prgcadd/Загрузки/Legacy-iOS-Kit_complete_v25.01.10/saved/ipwndfu/checkm8.py", line 500, in exploit
device.serial_number
File "/home/prgcadd/Загрузки/Legacy-iOS-Kit_complete_v25.01.10/saved/ipwndfu/usb/core.py", line 830, in serial_number
self._serial_number = util.get_string(self, self.iSerialNumber)
File "/home/prgcadd/Загрузки/Legacy-iOS-Kit_complete_v25.01.10/saved/ipwndfu/usb/util.py", line 314, in get_string
raise ValueError("The device has no langid")
ValueError: The device has no langid
in downgrade (ios 10.3.3)