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What is this?

While advanced users capable of using the command line can test if their keys are genuine, and update them via, this project lets you do the same more easily using any WebAuthn-capable web browser (all current versions of Chrome, Firefox, Edge, Opera, Vivaldi, ...).

To use it, visit and follow the instructions.

What does it do?

In a first step, it inspects your key to determine whether you have a Solo Secure or a Solo Hacker.

During this process, the signature of the key is checked, letting you determine whether your key is genuine.

Once this is done, it tells you whether the firmware is out of date. If so, we recommend you update, to receive bug fixes and possibly additional functionality.

To do so, you need to unplug your key, and plug it in an while keeping its button pressed, until the LED light blinks.

Once this is done, your key is in "bootloader mode" and can be updated by the website.

You can simply click on "Update Firmware", and your key will be updated.

NOTE: Due to how this update is implemented, while your firmware is being updated you will see a LOT of popups (that disappear again immediately). This is no reason for concern!

How does it work?

For general information on WebAuthn, the new standard for secure login in the browser, we recommend the following sites:

This standard replaces its predecessor, U2F, and consists of two API methods:

  • navigator.credentials.create()
  • navigator.credentials.get()

We use the first method to verify that your Solo is genuine, and determine whether it is the secure or the hacker version.

We use the second method to update your key if necessary. The method used is to encode custom commands that your key understands, and send these encoded commands as "keyhandle".

Hosting & Verification

The site is hosted on Netlify, as configured via netlify.toml.

Running solo-webupdate locally

For advanced users only

  1. Download or clone the solo-webupdate repo to a directory on your machine.
  2. Enter the solo-webupdate directory in your terminal and run the following two commands:
make setup-local
make serve-local

Note that you may get messages about missing packages and dependencies when running the make setup-local command. Install and then run the command again.

  1. If all goes well, you will get a message serving on http://localhost:8080. Visit http://localhost:8080 to access webupdate on your machine.
  2. Follow the on screen directions to update your firmware. Do not leave the webupdate window or change tabs when running webupdate. Stay on the webupdate page until the process is complete. This does not take long.


  • If your Solo is stuck in bootloader mode (yellow flashing LED) and webupdate won't detect it, then you may need to use Advanced Mode to re-flash the Solo Key.
    1. Make sure you know which version of the Solo Key you are working with. It's either Solo Secure or Solo Hacker.
    2. Click on the Advanced Mode (DANGER ZONE) button.
    3. Select the appropriate Solo Key version you have and follow the on-screen instructions.

One technical detail: Our official firmware builds are hosted as releases under, with the file STABLE_VERSION specifying the latest stable version. Unfortunately, due to CORS restrictions, these files can't be fetched by your browser during the update process. For this reason, the current latest builds are fetched and hosted on the update site itself, which always checks whether its firmware is out of date.


Website to easily update Solo firmware on keys.



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