In August 2005 Sony released version 2.0 of the firmware which included the web browser, file compatibility updates and other features. Hackers and other homebrew enthusiasts then encountered the first trojan for the PSP. Symantec called this trojan "Trojan.PSPBrick". Users attempting to downgrade their PSP using this software instead found that it was rendered inoperable as this software deleted mandatory/important system files. Over the course of 2005 Sony released six different versions of the firmware and hackers typically responded to it by downgrading to avoid the new security updates.