I think you only semi bricked it...if you can enable USB from the recovery still, I think you can just set NitePR to 0 in game.txt, then reinstall NitePR before enabling it again, and everything will be fine...this happened to me before with the Ultimate VSH menu plugin, and that fixed it...

However, if that doesn't fix it, you can always try Recovery Flasher, or use a Pandora/MMS to reinstall your CFW...