Your PSP is definitely bricked at this point. There may be hope, though...
It depends on whether you reflashed it with a custom firmware at any point. If you did, holding down the right trigger (R) during startup may bring you into a recovery mode, at which point, you may recover from a flash file on your Memory Stick. You can Google around for directions on how to do this.
If you didn't install a custom firmware at any point, you will probably have to send it in to Sony like pardizzone said, since there is no recovery mode available in Sony's official firmware.
If you removed the battery during the update then you basically bricked the unit and will need to call Sony to get it repaired.
I believe if it's still under warranty it will be covered. If not it's around $90.00 to get it fixed.
Your PSP is definitely bricked at this point. There may be hope, though...
It depends on whether you reflashed it with a custom firmware at any point. If you did, holding down the right trigger (R) during startup may bring you into a recovery mode, at which point, you may recover from a flash file on your Memory Stick. You can Google around for directions on how to do this.
If you didn't install a custom firmware at any point, you will probably have to send it in to Sony like pardizzone said, since there is no recovery mode available in Sony's official firmware.
I'm suprised no one has asked yet, but why did you remove your battery, after the numerous warnings on the preloading screen?
The question of all questions... :-)