RGH got reflashed still doesn't boot. What do I do?

My RGH wasn’t working so I took it to the guy that modded it he said he reflashed it but it’s still at the same problem and doesn’t boot to the dashboard. I’ve heard I need to put the dashlaunch files onto a usb and turn it on without the hard drive but do I need to edit any of the files? Also the guy said to maybe change the settings on cr4xl but what else would I change them to? The xbox is a trinity and the 3 and 4 switches are on.