yea z4 is the only way to root in my opinion... if its not rooting your phone then there is a reason for it... so if i understand correctly, you have a droid x currently unrooted and running the latest version of froyo... you are trying to root with the one touch z4 method and it is unsuccessfull... ? if that is the case try wiping data/cache and then rooting... if you are going to be running any custom roms ( reccommend liberty 1.5 or apex 1.4.1) then you will have to wipe anyway. that should do the trick, if not then there has to be something else going on, hopefully you didnt download z4root from the marketplace, there is a fake method out there that is harmful to your phone...