Exception: Invalid status 6700 when using getFirmwareVersion()

[nearestneighbour]

On Ubuntu 17.10 using Python 3.6. Ledger Nano S is connected and unlocked.

After installing btchip-python with pip3 I ran the following code from getFirmwareVersion.py:

from btchip.btchip import *
import sys
dongle = getDongle(True)
app = btchip(dongle)
print(app.getFirmwareVersion()['version'])

The 4th line prints the following output:

=> b'e0c4000000'
<= b''6700
=> b'f026000000'
<= b''6e00

When executing the getFirmwareVersion() function in the 5th line I get output:

=> b'e0c4000000'
<= b''6700

And error:

BTChipException Traceback (most recent call last)
<ipython-input-4-9d5272afbb74> in <module>()
----> 1 app.getFirmwareVersion()

/home/username/.local/lib/python3.6/site-packages/btchip/btchip.py in getFirmwareVersion(self)
559 apdu = [ self.BTCHIP_CLA, self.BTCHIP_INS_GET_FIRMWARE_VERSION, 0x00, 0x00, 0x00 ]
560 try:
--> 561 response = self.dongle.exchange(bytearray(apdu))
562 except BTChipException as e:
563 if (e.sw == 0x6985):

/home/username/.local/lib/python3.6/site-packages/btchip/btchipComm.py in exchange(self, apdu, timeout)
125 print("<= %s%.2x" % (hexlify(response), sw))
126 if sw != 0x9000:
--> 127 raise BTChipException("Invalid status %04x" % sw, sw)
128 return response
129

BTChipException: Exception : Invalid status 6700

[sammchardy]

@nearestneighbour what did you do to resolve this issue?

[fabioapuana]

I have precisely the same issue working on Win10 and Python 3.7.
I can communicate with no problem using ledgerblue API. Now I need btchip in order to build a transaction, sign it and so on.

Could you kindly help me?

Thanks,
Fabio