@Felizf i usually read my phone and save the config before changing anything, that said, im not sure if there is a way to factory reset the phone back, you could try the factory reset in the phone options, but i dont think it changes your QPST information, though it may.
My best suggestion would be to find a Cellular store in your area and take your phone to them and see if they can follow this guide for you to enable these settings. They may have a charge associated with flashing your phone, but it may be the best option.
Also are you on a Hero or a Eris?
iv been extremely busy with work lately, but ill see what i can do to help.
ill take Screenshots of my config later for you so you can compare your settings to what i have.
Im on an Eris though, but i assume they should be the same since i followed Brandon's guide as well.