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. Sony released version 1.51 of the PSP firmware in May 2005 to plug the holes that hackers were using to gain access to the device. On 15 June 2005 the hackers distributed the cracked code of the PSP on the internet. 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. BusinessWeek dubbed this the "carrot-and-stick" approach. The AdvancedPSP forums, which hosted the project, were shut down by the hosting and the project moved to wololo/talk forums. wololo also created a new public SVN repository for HBL at Google Code. Other PSP hackers such as Davee and neur0n joined in to help the development of this port. HBL for Patapon 2 passed to beta version, and can be considered the first useful HBL version, released on March 2010. Changing the firmware of a device may rarely or never be done during its economic lifetime; some firmware memory devices are permanently installed and cannot be changed after manufacture. Common reasons for updating firmware include fixing bugs or adding features to the device. The first concept images of the PSP appeared in November 2002 at the Sony Corporate Strategy Meeting and showed a PSP with flat buttons and no analog stick.
