Xbox dashboard missing

Hi, this is my first thread, and I was just wondering if I’m screwed…
So, I tried soft modding my xbox, and I didn’t back up the dashboard:(
when I boot up my xbox, it gives me the service error 16 message, and I cant even load games that I put in before I boot the xbox. I’m not familiar with Slayer auto install or AID, and I’m not sure if it would even do anything. I just wanted to know if there was anything that I could do. I have 2 xbox’s incase that helps and it was a soft mod, not a chip. Please give me suggestions if possible