im not sure i should continue to help you after knowing you want to run a wp7 rom instead of a beautiful android rom
all kidding aside,have you checked to see if unrevoked was able to install clockwork recovery? power the phone off,boot to hboot via vol down+power,and then select recovery from the hboot screen. does it take you to clockwork,or to a red triangle,!,and pic of a phone?
if you get clockwork,you can easily flash superuser 3.0.7
with clockwork,and be rooted. as ive said many times in the thread,the main reason to use unrevoked over another method is to get clockwork recovery installed.rooting is easy once you have a custom recovery.
if you dont have clockwork,and want to try the zergrush method,check the "download these files" step of the OP,and notice that the latest zergrush is included in the mirror.
however it appears that at some point an OTA has patched the zergrush exploit(wich may also be why some are having trouble with unrevoked 3.21) so it may or may not work,dep on the state of your phone. if you do get the "hellions with blue flames" message above,you can try fre3vo to get temp root,im pretty sure it will work. directions are a couple posts up,youll just substitute the zergrush commands in post 2 for the fre3vo commands above.
wich brings us to:
im starting to change my mind about htcdev,in that it may actually be the most reliable way to root and downgrade,as its using htcs own unlock method. so far it has worked fine for the few that have used it,and went without a hitch even on my junk spare inc.
the disadvantages are:
-it may void all or parts of your warranty
. while if the rooting is successful,all visual signs of htcdev can be removed(i.e. the relocked
1.02.0000 bootloader),the identigier token does contain bits of info uniquie to your phone,and could
be kept on file at htc,and as such a warrantly claim could
be denied because of it. while personally feel such a scenario is unlikely(htc has better things to do than search each phone it gets back for signs of being rooted),it may be possible and i accept no liabilitys. most incredibles are prolly old enuff that there is no mfg warranty left,anyway.
-it will wipe your data,it will wipe your data
,it will wipe your data. did mention it will wipe your data?
performing the bootloader unlock will perform a factory reset at the same time. no way around it,currently. at least none that is easy,that i know of.
just holler if you have further questions on any of the methods