A bit hard to do it yourself as you need a Z board which you have to either buy from overseas or make yourself and not easy. Depending on where you are Hotchips in Sydney do it for $50 without postage or insurance..
SatFact's will have a complete dyi allcamming in the next issue
from making a z-baord and contacting it, to flashing back to original firmware and 2.08 loader, then it allows acess to the serial port and to load any firmware