What do I need??

[my80chevette]

Okay I havent been on here for a long while but heres an update. I finally got the wifi and gps to work on my Sprint Mogul. I also got the update from Mobile 6 to 6.1 and installed it with no problem. I have since tried the nuespl to try to unlock my phone and Im no sure if it worked.... So I went ahead and tried to install the Tinkerbell Titan upgrade but it stops shortly after the gray loading screen on the phone comes up. The phone recovers to the 6.1 fine but I don't really want to try over and over and chance a bricked phone. I was wondering if it might be the sd card Im using. I have a 4 gig card in the phone and I have seen where some updates say a 2 gig card. Just seeing if there is any advice on how to proceed? Would like to have new rom so any help appreciated!!