Read error connecting to Ledger Nano X

[dkaparis]

Using current release 4.2.7 on Arch Linux.

Attempting to connect to Ledger Nano X device when opening a hardware wallet file gives a popup error message: read error.

The following traceback is output on terminal:

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/electroncash_plugins/hw_wallet/qt.py", line 225, in run
    result = task.task()
  File "/usr/lib/python3.10/site-packages/electroncash_plugins/ledger/ledger.py", line 633, in get_client
    client = devmgr.client_for_keystore(self, handler, keystore, force_pair)
  File "/usr/lib/python3.10/site-packages/electroncash/plugins.py", line 868, in client_for_keystore
    client = self.force_pair_xpub(plugin, handler, info, xpub, derivation, devices)
  File "/usr/lib/python3.10/site-packages/electroncash/plugins.py", line 898, in force_pair_xpub
    client_xpub = client.get_xpub(derivation, xtype)
  File "/usr/lib/python3.10/site-packages/electroncash_plugins/ledger/ledger.py", line 47, in catch_exception
    return func(self, *args, **kwargs)
  File "/usr/lib/python3.10/site-packages/electroncash_plugins/ledger/ledger.py", line 100, in get_xpub
    self.checkDevice()
  File "/usr/lib/python3.10/site-packages/electroncash_plugins/ledger/ledger.py", line 218, in checkDevice
    self.perform_hw1_preflight()
  File "/usr/lib/python3.10/site-packages/electroncash_plugins/ledger/ledger.py", line 167, in perform_hw1_preflight
    firmwareInfo = self.dongleObject.getFirmwareVersion()
  File "/usr/lib/python3.10/site-packages/btchip/btchip.py", line 563, in getFirmwareVersion
    response = self.dongle.exchange(bytearray(apdu))
  File "/usr/lib/python3.10/site-packages/btchip/btchipComm.py", line 90, in exchange
    result = self.waitImpl.waitFirstResponse(timeout)
  File "/usr/lib/python3.10/site-packages/btchip/btchipComm.py", line 134, in waitFirstResponse
    data = self.device.read(65)
  File "hidraw.pyx", line 219, in hid.device.read
OSError: read error

System is up-to-date, with python-btchip 0.1.32-2 and ledger-udev 1-7 installed.

Ledger Nano X firmware version is 2.0.2.

The issue could be related to a recent Ledger firmware update, since this same device and system were working properly previously.

[cculianu]

Yes, there is a known issue with the Ledger Nano X with the latest firmware. Electrum-ABC is also experiencing this. The bug is in the python-btchip library, sadly, so we need them to fix it. LedgerHQ/btchip-python#52

Is a firmware downgrade possible?

[dkaparis]

There seems to be some development on Ledger apps addressing this: LedgerHQ/app-bitcoin-new#36.

After updating the Bitcoin and Bitcoin Cash apps on ledger to newly released version 2.0.5, the wallet can now connect to ledger and sign transactions without error.