Eh, this is why we always told people not to use programs that automatically flash your flash0
Anyways, boot into recovery mode (turn psp completely off and hold R trig when you turn it back on), toggle usb on, put 1.50 recovery files on it, then run it using one of the options on the recovery menu (the thing that lets you run blah blah blah at that one location lol) and it will flash 1.50 back to your psp and then all you have to do is upgrade back to a custom firmware.
Here is the link to the 1.50 winstaller: (it puts the recovery files automatically on your psp for you)
http://forums.afterdawn.com/thread_view.cfm/460892
If you don't understand anything, just ask. O and next time make your own thread if you want to ask questions.