I have this xbox, and it boots up to error 21 prior to me putting a modchip in. So, I do a clean install, and now it boots up to the flashbios screen, and I receive an error message saying, "bad ablity 0 - falling back to 10hd" with a few other things in a paragraph form. ONe of the lower lines says, "tcp/ip initialization failed". But, i know for sure that my xbox is connected correctly cause my other modded xbox connects up fine online. **keep in mind that this errors only when i attempt to flash via http.**thanks