Custom firmware, such as HENkaku Enso, allows users to install a specific 3.60 or 3.65 PSP2UPDAT.PUP to gain homebrew capability and "permanent" hack status.
Tools like allow users to "roll back" their firmware to older versions (like 3.60 or 3.65) which are more stable for hacking. To do this, the tool requires a valid PSP2UPDAT.PUP file of the target firmware version to be placed in a specific folder on the memory card. Tips for Managing Updates psp2updatpup
Reputable sources for psp2updat.pup files include: Custom firmware, such as HENkaku Enso, allows users