Updating custom firmware on psp
The last generation of a long history of PSP Custom Firmware, with a pedigree from Dark Ale X's original code.
It's been made open source and still gets bugfixes even to this day.
Keeping your PSP's firmware up to date is important if you want to take advantage of all the neat features Sony has included.
Many new game releases will also require you to have a certain firmware version to play on your system.
Choose the one that you prefer; though in truth, they are almost identical.