Go to
http://www.mirc.com/get.html and download mirc.
Go to EFNet to the channel (chat-room) #xbins
Read the topic and find out how to get on the ftp of them.
Download your desired BIOS (fnd out which one you want with the serach function of this board. e.g. search for xbit which bios)
Use your copy of X-BIT.exe to flash your xbit chip, with the bios you got from #xbins.