*i have an at&t iphone 4 with official firmware 4.0 *no more shsh blobs for 4.1 and below, i was only able to get 4.2 shsh blobs *running itunes 10.0(67) read and found there might be a way to go to 4.1 from 4.0 without baseband upgrade with pwnage tool with a custom firmware as you need 4.1 shsh blobs with the tinyumbrella way question is: is it true that i really don't need shsh blob for 4.1 if i use pwnage tool cfw without baseband upgrade to get me from 4.0 ofw to 4.1 cfw? if this way is possible,do i need to jailbreak first my ofw 4.0 before i can upgrade to 4.1 using PT cfw? will my phone be activated (using activate phone in expert mode with pwnage tool) and can be used for international phone sims when i use ultrasnow after the pwnage tool jailbreak? can i make a PT cfw without activation since I have an AT&T sim?(i don't have 4.1 shsh blobs) lastly, if it is possible to upgrade from my 4.0 ofw to 4.1 cfw using PT, what if something happens to the phone needing for it to be reverted to the 4.1 cfw i prepared. is this possible? (since I cannot revert back to 4.0, 4.01, 4.02, and even 4.1 ofw since I was not able to save the shsh blob). any input would be highly appreciate. I've been searching for answers for week now.