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src/content/blog/fix-adb-unsufficient-permission-linux.md

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+---
+title: 'Fix ADB Insufficient Permission'
+description: 'udev rules for fixing ADB Insufficient permission in Linux'
+date: 2025-02-24T11:29:30+07:00
+draft: false
+tags:
+  - android
+  - adb
+  - linux
+---
+
+# Why need this?
+Connecting an Android device to a Linux computer could has problem with permission. Listing devices with `adb devices` might show `unauthorized` status or `insufficient permission` error message.
+
+```bash
+$ adb devices
+
+List of devices attached
+15241JEC211677  device
+RR2M9002AHY     unauthorized
+```
+
+This happens because by default, in Linux, when you connect an Android device via USB, the system assigns it to the `root` user and a restrictive permission mode (often 0600), meaning that regular users cannot access it.
+
+# How to fix
+
+1. Check `vendor id` and `device id` from connected Android device with `lsusb`.
+
+```bash
+$ lsusb
+
+...some other devices
+Bus 001 Device 005: ID 18d1:4ee7 Google Inc. Nexus/Pixel Device
+```
+
+`18d1` is *vendor id* and `4ee7` is the *product id*.
+
+2. Create an `udev` rule for this device, I create mine in `/etc/udev/rules.d/51-android.rules`.
+
+```bash
+SUBSYSTEM=="usb", ATTRS{idVendor}=="18d1", ATTRS{idProduct}=="4ee7", MODE="0666", GROUP="plugdev", SYMLINK+="google_pixel_4a_%n"
+```
+
+- `SUBSYSTEM=="usb"` ensures the rule applies only to USB devices.
+- `ATTRS{idVendor}=="18d1" and ATTRS{idProduct}=="4ee7"` match the Google Pixel USB devices by their vendor and product IDs.
+- `MODE="0666"` sets the device's permission mode to 0666, meaning read/write access for all users.
+- `GROUP="plugdev"` assigns the device to the plugdev group, which allows users in that group to access it.
+- `SYMLINK+="google_pixel_4a_%n"` creates a symlink (shortcut) under /dev/ with a readable name for easier identification.
+
+3. Reconnect the device to make sure the rule is correct. If not, try to reload `udev` rules and restart it.
+
+```bash
+$ sudo udevadm control --reload-rules
+```