Does the subject want to ask, "What is the reason for np manager to remove the signature verification flashback?" The reason for this is the following：

1. Incompatible plug-ins or applications are installed. When using NP Manager, if incompatible plug-ins or applications are installed, signature verification may fail and flashback may occur.

2. The operating system and application programs are incompatible. If your operating system is not compatible with NP manager, or NP manager itself has compatibility problems, it may also lead to signature verification failure and flashback.

3. Compatibility issues in games or applications. If you use NP Manager to install a game or application, but the game or application has compatibility problems with your PSVita device or other applications, it may also lead to signature verification failure and flashback.