使用ADB修改移动网络时提示无法打开settings.db数据库的问题求助

Let's walk through why you're hitting that error and how to fix it—this is a common permission/tooling issue when tinkering with system settings databases.

Why the error pops up #

The /data/data/com.android.providers.settings/databases/settings.db file is owned by the system user (usually UID 1000), and regular ADB shell sessions don’t have read/write access to this protected directory. On top of that, some stripped-down custom ROMs might not even have the sqlite3 tool preinstalled, adding another layer of hassle.

Step 1: Use the built-in settings command (simpler & safer) #

Instead of directly editing the SQLite database, use Android’s native settings utility—it’s made exactly for this kind of change and avoids permission headaches when possible.

1. First, try elevating your ADB session to root (if your device allows it):

   adb root
   

2. Then run the settings command to update your preferred network mode:

   adb shell settings put global preferred_network_mode 1
   

Step 2: If adb root doesn’t work (device is rooted) #

If your device is rooted but adb root is disabled (common on production builds), use su to get root access in the shell:

1. Launch a root shell:

   adb shell su
   

2. Now you can either use the settings command (same as above) or directly modify the database if you prefer:

   sqlite3 /data/data/com.android.providers.settings/databases/settings.db "update global SET value = 1 WHERE name = 'preferred_network_mode'"
   

Step 3: If sqlite3 is missing #

If you get a "sqlite3: not found" error even with root, stick to the settings command—it’s guaranteed to be present on all Android devices that support ADB.

Quick note on preferred_network_mode values #

Just a heads-up: the value 1 corresponds to GSM-only on most devices, but this can vary by manufacturer. If you need a different mode (like LTE or WCDMA), you’ll want to look up the correct numeric code for your specific device model.

内容的提问来源于stack exchange，提问作者Manju_Asthuthe