There is a reason why this time I am using the full version number; it's a pretty big number that has a lot of history behind it.
I have been working on ARK-4 for the past 6 years and had the pleasure of working with some of the best minds in the PSP Scene.
It has been quite a ride, and like all rides it eventually comes to an end.
ARK-4 has become technologically complicated to work with, it uses an old sdk that is no longer maintained, it has a lot of legacy code that can be replaced by much better and simpler approaches and it has become over-scoped (the project has to do things it's not meant to, or that should be responsibilities of other projects).
This is the last official release of ARK-4, which is only here to serve as a bridge for what's going to replace it: ARK-5.
Because I did not stop working on ARK-4 because I stopped working on PSP CFW, but because I can best reserve my time and efforts on the next big evolution of this beloved CFW. Update to this last release to unlock the ARK-5 OTA updates, and then update to ARK-5 or not, it's your choice.