Wow, well I really think what you need to do is a clear storage or hard reset. I would backup everything first with sprite. Now, If you are wanting to try 6.5 and a custom rom now is the time.
I say this because you will have to hard reset to flash anyway. In that case, do a backup and then you can unlock and flash . I recommend flashing a few roms before reinstalling everything back on though.
I suggest you start by reading through the unlocker thread first. It is a sticky in the Vogue Upgrades Forum. Use the 2.31 unlocker. You will want to upgrade your radio if you don't have a 3.xx.xx (GPS enabled) version. Then after you are unlocked, read some rom threads and tutorials. Read them twice if necessary. A good one is codybear's faq on xda-developers. Here is a link :
http://forum.xda-developers.com/showthread.php?t=508544
Good Luck!!!!