For those trying to unlock their sda, it's fairly simple as stated AT SPV developers. Reference the app unlock, you get the registry editor, and edit those 2 security polices, or you can simple download sda app unlock, available online. After you've done either of the two,it's advisable to download checklock.exe, and it'll tell you whether or not your phone is app unlock, which is the 1st step in unlocking the phone to use the spvservices file, cab file and typhoontools file. after you've app unlock, copy the cert cab file to the sda and run it. it should install with no issues. the next step is where everyone to include me has had problems with. I tried running spvservice through VISTA,and i would get "FAILED TO CREATE EMPTY DOCUMENT", i tried to be slick and copy the spv services exe file to the phone and run it from there, but when i got connect to SPV site, I would get RAPI INIT FAILED,AND ILLEGAL ZONE ERRORS. As knowledge as i am about phones and computers, i couldn't get past the errors. What finally worked is very simple, YOU HAVE TO RUN THESE FILES ON A WINDOWS XP COMPUTER. I dual booted my laptop and put XP on it, download active sync 4.5 for XP, this will install the drivers needed for the pc and the phone to communicate on active sync. simply rebooted, plugged my sda in, active sync kicked in, and then i simply ran the spvservices.exe, clicked on simunlock tool, typed agree, it'll tell you the phone is simlocked. Just press the button for SIMUNLOCK, it'll say success. YOU'RE DONE. no problems at all, it took no more than a minute to complete. Now for those that had the msg "YOU'VE TRIED 13 TIMES OR MORE, PLEASE WAIT FOR RETRY" msg, on the sda itself. It's because you keep entering in the wrong code. I called htc,the phone is preprogrammed to double the increments of time, everytime you attempt. according to htc i was to wait 85 days for retry, which was more than likely true. I had my att sim card in for days at a time, to see if the prompt would come up to enter the unlock code. Just use spv, it's so easy. Doesn't make a difference if your phone has you waiting forever, because of numerous attempts. Last bit of info, after many months of attempting to unlock the sda. These unlock companys only guess at the unlock code, i found out the hard way. Tmobile will give you the unlock code free if you close your account favorably. If the operator says no, call again speak to someone different. Their is no such thing as 90 day window after you leave tmobile.
Good luck i hope this helps those attempting to unlock their SDA.