The primary suspects are Windows User Account Control (UAC) and folder permission attributes. If 3uTools is launched without administrative privileges, it may lack the authority to write to protected directories, such as C:\Program Files or system temp folders. Similarly, the target folder—perhaps a custom backup location on an external drive—might have permissions explicitly denying write access to the "SYSTEM" or "Authenticated Users" groups. A second, frequent culprit is interference from antivirus or real-time protection software. Security suites, wary of any tool that deeply accesses another device's file system (like 3uTools does with iOS), may quarantine or block write operations, triggering a permission failure. Lastly, the physical connection or driver state can masquerade as a folder error: if the iOS device is locked, untrusted, or in a recovery state where its file system is not fully mounted, the host PC sees an inaccessible folder.
The most frustrating aspect of this error is the lack of clarity provided by the software. When the error pops up, it rarely specifies which folder it failed to access. Is it the backup folder? The temp folder? The photo cache? 3utools failed to access folder error code 13 new
(UDID) in lowercase. You can find this ID in 3uTools by clicking "View iDevice Details". Change the USB Port The primary suspects are Windows User Account Control
This guide will walk you through exactly why this "new" error occurs and the definitive steps to kill Error Code 13 for good. A second, frequent culprit is interference from antivirus
. This gives the program higher permission levels to access system and protected folders. Disable Antivirus/Firewall Temporarily