If you have root, grant superuser access when prompted. Then, in settings, enable “Root Explorer” and mount /system as writable. Unlike modern apps, 3.2.5 will simply work.
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: All powerful "power user" features—like Root Explorer, FTP/LAN support, and cloud storage integration—work fully without requiring a "Pro" subscription. Key Features of 3.2.5 If you have root, grant superuser access when prompted