Hackers refused to apply updates which would render their hacks unusable so Sony attempted to convince users that there was a benefit to upgrading by including new features in the firmware updates, such as a web browser, and not just security patches to plug the vulnerabilities.Business Week dubbed this the "carrot-and-stick" approach. Users attempting to downgrade their PSP using this software instead found that is was rendered inoperable as this software deleted important system files.One of the drawbacks of downgrading the PSP is that new legitimate media may require the presence of a new firmware edition.A hacker by the name of Dark Alex had released a custom firmware called "Dark Alex's Open Edition firmware" which opens the firmware but allows users to use the existing feature set of the current edition.But our stance on piracy is clear, and we hope to be role models.Sony have never been in touch with me, so I am confident that what we are doing is legal." Soon after the PSP was released hackers began to discover exploits in the PSP that could be used to run unsigned code on the device.Hackers have stated that the motivation for unlocking the PSP has nothing to do with piracy, but allowing individuals full access to the products they've purchased and the freedom to do what they want with the item as well as the interest in exploring something unknown. ", stated: "Everyone has the right to do what they want with their own hardware.
On June 15 2005 the hackers distributed the cracked code of the PSP on the internet.
On April 17th, 2005, a DNS redirection trick was discovered in the content-downloading feature of the game Wipeout Pure that allowed regular HTML web pages to be displayed in place of the official website.
Sony quickly patched the firmware again, continuing the carrot-and-stick game with the hackers and users.
In 2006 Sony released six editions of the firmware and in 2007 they released another six editions.
Hackers and other homebrew enthusiasts then encountered the first trojan for the PSP. In Mid-2006, after several months of problems in defeating the PSP's firmware a file was posted online which allowed new PSPs running firmware version 2.6 to downgrade to 1.5 so they could then be hacked using older methods.This reportedly caused more buzz in the community than any recent official offerings for the device.