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Download the Gerfaut APK from the GitHub release page or the download page. Gerfaut runs on Android 7.0 or newer.
Gerfaut is in public beta and has had little testing. Check every address and amount on your signing device before you rely on it. Report anything that looks wrong on GitHub, as Contact explains.

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Install Gerfaut

Check the APK against the signed hash list before you install it. See Verify a download.
1

Download the APK for your processor

Take the file that matches your phone:
2

Open the downloaded file

The first time, Android asks you to allow apps from unknown sources, for your browser or files app on Android 8 and newer. Allow it, then open the file again.
3

Select Install

Android checks the signature of the APK, then adds Gerfaut to your launcher.
Every release is signed with the same certificate. Run apksigner verify --print-certs on the APK, from the Android SDK build tools, and compare the SHA-256 digest of the certificate with this one:
A different digest means a different signer, whatever the file is called. Do not install that file.

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Take the welcome tour

On its first launch, Gerfaut opens a welcome tour of four pages. Select Next to read it and Get started on the last page, or Skip to close it.

The first page states that Gerfaut holds no private key and signs nothing. Skip closes the tour from any page.

The home screen then reads No wallets yet. Select Add a wallet and continue with Add a wallet.
Replay the tour from Settings > About > Show the welcome tour.

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Update Gerfaut

Gerfaut asks GitHub for the latest release at most once a day while it is unlocked, starting a day after you first open it. It tells you once about each new version, and never about a pre-release.
The check reaches GitHub from your IP address and carries no wallet data. With a .onion backend, it goes through Tor instead, and waits for Tor rather than start it.
1

Select View release

A card such as Gerfaut 0.2.0 is available appears at the top of the home screen. View release opens the release page in your browser. Later hides the card until the next version.
2

Install the new APK

Download the APK for your processor and install it over the current one. Android keeps your wallets, because the same certificate signs both versions.
To check by hand, select Check for updates in Settings > About. A version found this way shows there, and the home screen card no longer announces it. To stop the daily check, turn off the Check automatically switch there.