Well here it is HostCore for 5.50gen-d3. it was done with modification to the original source from Poison. Contains all the original features from the previous version plus the 5.50 compatibility. I only did modification to the usb portion so wifi may or may not work. It's only been tested on a psp phat. if you're having problems with it on a slim. or wifi isn't working correctly let me know i'll see what i can do. BTW I'm not a programmer nor do i claim to be one. I just wanted to get HostCore working on 5.50. it should also work on older CFW versions as well.
To anyone interested, i posted links to my modified source of hostcore, also included a diff of the changes from the original which is located svn on google-codes
decided hostcore wouldn't be hostcore without wifi, so i have gotten it to work with phat. still a few bugs and slim compatibility issues but hopefully will have it fixed with next update.
I have now gotten wifi working on both slim and phat psps on cfw 5.50 gen d3. still a few bugs but i can live with it. so i have finally accomplished my task of making hostcore 5.50 compatible. now it's back to my other life :P will be posting the source s soon as i clean it up
still can't add it as attachment grab it here
for the source you can grab it here