Prepare the phone

1. Install adb on Ubuntu

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sudo apt install android-tools-adb

2. Enable Developer Options Settings → About Phone → Tap Build Number 7 times.

Go to System → Developer Options

Enable USB Debugging

3. Plug in phone via USB → Approve ADB debugging Run:

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adb devices

Make sure phone appears in the list.

Use the app

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wget https://github.com/Genymobile/gnirehtet/releases/download/v2.5.1/gnirehtet-rust-linux64-v2.5.1.zip
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unzip gnirehtet-rust-linux64-v2.5.1.zip
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cd gnirehtet-rust-linux64/
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chmod +x gnirehtet

Run

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./gnirehtet