I just did this all from within the phone. its easy, I came from an iPhone too so ill try to help you out.
1. Download Opera Mini to save the update.zip file to your phone.
- The file is on the first post. So use opera mini to hit the download file.
- Opera mini will ask you where to save the file to. The default should be /sdcard so save it to there.
2. Open a program called "My Files" it should be included by default with your phone.
3. Look for the file that was downloaded to /sdcard and rename it by holding down on it. A list will appear and click rename. and name it to "update" there is no need to add the ".zip" because it already knows what kind of file it is. ***
4. Once it has been renamed. Turn off your phone.
5. Hold down both the volume keys and power key as stated in the first post. "(note: let go of the power button after seeing initial boot screen, otherwise it'll continue to power cycle)"
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" - Select Reinstall Packages from the recovery menu using Volume Up and Down to navigate, and Power to select
- Phone will automatically reboot, and you will have root privileges, and the Superuser program installed."
hope this helps man. it took me less than 30 secs and it was all done within my captivate