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http://piratebox.cc/openwrt:troubleshooting
I removed all the files from my USB stick and I'm not able to connect anymore. Is it bricked?
Don't panik. If you only removed the files on the USB Stick, the Box is using all the configuration, which was moved from the original system to the USB stick. This is the reason, why you can't connect easily anymore- the DHCP server is not working anymore. In the most situation, it could be the easiest solution to simply relash the device. For this copy your firmware image file and a copy of you unzipped install folder, then follow this Reflash using an USB Stick-HowTo. Please plugin the USB after you successfully logged in via failsafe mode.
Try to figure out how to change network configuration, this is crucial for fixing this.