After you have followed those directions, THIS IS IMPORTANT PEOPLE, go thru the setup, *228 option 1 and all.
Go ahead and do a factory data reset/wipe your phone from Settings>>Privacy>>Factory Data Reset
After wiping the phone re-root with Gingerbreak and instal Tenfar Lin's Recovery.
Tutorials for rooting and installing recovery as well as additional download links/mirrors can be found in the sticky or here:
Place the downloaded GB Pre-Rooted file un the root(top of filesystem/not in any folder) of your externad sd card and rename to "update.zip".
Reboot into recovery thru Tenfar's Bootstrap Recovery app and select "Apply SDCARD : update.zip"
NOTE : It will take a long time, about 15 minutes... EDIT: I dont remember how long it takes with the new prerooted version.... I did this at work yesterday...
Reboot your phone. IT WILL BOOTLOOP!!! EDIT: If it bootloops, pull battery, reboot holding power and volume down, use volume down to scroll to stock/built in recovery, press volume down and up at the same time twice until you get the menu, wipe/factory data reset....
The phone will seem to stall at the eye, but give it time... EDIT: I wasnt watching as I was doing this at work....
Eventually you will be at your home screen and all will be well and rooted in the wonderful world of GingerBread!!
GO TO P3DROID'S WEBSITE AND DOWNLOAD THE FILES THERE! HE HAS CORRECTED THE "ASSERT FAILED/INSTALLATION ABORTED ERROR"!
I will be SBF-ing my phone back to stock and applying P3Droid's new pre-rooted GB update...
I will update this post when I finish...
Been here, Done this, all is well and rooted in the land of GingerBread!!!