Thank you for the quick reply!
The original firmware I flashed to was povided by support.dell by inputting my Service code, the only file on my computer that might be is DE04.bin. In hindsight I trusted Dell a little too much by not paying very close attention and will never again.
I have seen newer BIOSes and they have a boot to USB option. In my BIOS under BOOT, I have cdrom, hdd, broadcom, removable devices. When I restart with my USB plugged in, it shows up as "system3 USB" in the hdd section in boot. I can disable the main hdd by pressing "shift & 1" but it still says "no operating system" and stays there.
I kinda thought the usb would show up under removable devices but it just lists as a HDD. I have an external USB 1TB that also shows up in that HDD list but I have it disconnected while rebooting to avoid confusion.