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For iOS 9.3.5, Filza File Manager is a powerful tool used to manage system files, though it typically requires a jailbreak to access the full root directory. On this specific legacy firmware, the most reliable way to get a "verified" and functional version is through the Phoenix jailbreak. Core Installation Method (Jailbreak)
Backup First: Filza gives you the keys to erase your entire operating system. Never delete files in the / or /System directories unless you know exactly what they do. filza file manager ios 935 verified
Verify that the default BigBoss repository is installed (Filza is hosted here by default). Go to the Search tab and type in Filza File Manager. For iOS 9
Cydia (Jailbreak Method): This is the most reliable way to get a fully functional version. Open Cydia on your jailbroken device. Never delete files in the / or /System