IOError: open failed

Hi there. I have the ledger nano s and I’m trying to verify the Secure Element by following the steps given on Ledgers web site.

I made sure to install dependencies first with sudo apt install libudev-dev libusb-1.0-0-dev virtualenv Then per their instruction installed ledgerblue package with sudo pip install --no-cache-dir ledgerblue

Now when I run python2 -m ledgerblue.checkGenuine --targetId 0x31100002

I get the following error Traceback (most recent call last): File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.7/runpy.py", line 72, in _run_code exec code in run_globals File "/usr/local/lib/python2.7/dist-packages/ledgerblue/checkGenuine.py", line 127, in <module> dongle = getDongle(args.apdu) File "/usr/local/lib/python2.7/dist-packages/ledgerblue/comm.py", line 188, in getDongle dev.open_path(hidDevicePath) File "hid.pyx", line 72, in hid.device.open_path IOError: open failed Note I’m using Ubuntu 16.04.2 LTS. Hopefully this is just some simple fix, like maybe I’m not using the correct version of everything.

[Sajjon]

TL;DR: Quit macOS desktop app Ledger Live if it is running

Running macOS (host), not using Docker/Python virtualenv, I wanted to delete a Ledger App I previously had installed with python -m ledgerblue.App. In my Terminal I tried running:

python -m ledgerblue.deleteApp --targetId 0x31100004 --appName NAME_OF_APP_TO_DELETE

(where 0x31100004 is the id of a Ledger Nano S, with firmware 1.6.0)

That resulted in an error:

Generated random root public key : b'0481ba79845ad171de2c0f0e38badfbaeede3ec022e7dd8cf5edc406af06d3f6ee10100649bfbcfeb76ac062d41f327afe6532dd45f430fe0febcbd734a549151f'
Traceback (most recent call last):
  File "~/.pyenv/versions/anaconda3-5.3.0/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "~/.pyenv/versions/anaconda3-5.3.0/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "~/.pyenv/versions/anaconda3-5.3.0/lib/python3.6/site-packages/ledgerblue/deleteApp.py", line 75, in <module>
    dongle = getDongle(args.apdu)
  File "~/.pyenv/versions/anaconda3-5.3.0/lib/python3.6/site-packages/ledgerblue/comm.py", line 216, in getDongle
    dev.open_path(hidDevicePath)
  File "hid.pyx", line 72, in hid.device.open_path
OSError: open failed

I tried using sudo python -m ..... but did not help. Then I realized that I had the Desktop app Ledger Live running, after I quit that and rerun the command, it succeded! And I was able to uninstall the app.

[AronVanAmmers]

For me running the command with sudo is a workaround for this issue.

For ECPy / Python 2.7 there is a workaround here https://github.com/LedgerHQ/blue-loader-python/issues/29, however in my experience the results are the same.

I’m now stuck on https://github.com/LedgerHQ/blue-loader-python/issues/26 with Invalid sequence, so can’t confirm that the above leads to a working end result.