SerialTweaker is a tool that can be used to load a serialized object, change its contents, and reserialize it to a new serialized object with modified fields inside.
You can download it from the following link: https://packetstormsecurity.com/files/download/156572/SerialTweaker-master.zip
Source: https://packetstormsecurity.com/files/156572/SerialTweaker-1.1.html