also that guide you qouted, although it is the same as what I posted (i found it minutes later after i posted this LOL) it's purpose is to reset your phone to stock and a much easier way to do so is
if you already have the apx drivers installed, all you have to do is take out battery hold vol keys plub in usb let go keys and then run the bat
i've softbricked my phone multiple times
also is very difficult to hard brick this phone the nvflash apparently works on a very low level. the only problem is when you think you have have an o2x from wind and flash the wrong baseband. THEN your method (and my same method) will fix it
not to mention that the only difference in that and this guide is that that one requires you to flash to stock recovery. is why I asked later if it was required. someone confirm/deny!
(if you tried it and it worked plz post what you used. if it didn't work plz post the problem)