I have a JB iPhone, but don't have a fundamental understanding of some of the ideas and terms. Is there a good spot to read some of this? Here is what I'm dealing with: I have somehow actually been locked out of my iPhone 4 running 4.02 and JB. I am going to have to do a complete restore, but don't want to upgrade my baseband in the process. I have run TU... but I just hit the display SHSHs button and it only shows 4.0 listed as a cached file. I'm worried that I dont have 4.01, 4.02 and 4.1 listed. The bottom line is, while I understand some of the ideas of JBing, I dont understand what the term baseband actually refers to, what the TSS server means and does, or that Im even using TU correctly to save the various SHSH blobs to give myself maximum flexibility should I need it. Can anyone shed any light on these issues, or point me to a place where I can read some basic info on all this stuff? Also, what's the best process for upgrading to 4.1, without upgrading my baseband? I was planning on waiting to learn and use Pwnage Tool on Sunday as I'm a mac user, but now need to use either GP or LR as I dont want to be locked out of my phone until Sunday. I know, such a ridiculous situation... Thanks for any help.