Xenium mod chip bios help

Ok, so Im helping a friend get his xbox all fixed up. It was modded with a Xenium chip. We were using AID to install and upgrade a newer dashboard, and when we rebooted...the bios menu came up. There were 2 bios's saved I guess already and I think I selected the wrong one. When I try to turn the xbox on, the load screen just flashes and tries to start up again. Ive tried reinstalling the dashboard to reselect the other bios but the screen doesnt come up anymore. Did I ruin the bios? Do I need to reflash? I dont have any backups so I dont know what to do. Someone please help!