Okay I'll help clear the air for some people who seem a little confused about this whole 3.2.1 warning
If u r jailbroken, do not upgrade ur firmware
If u accidentally did upgrade, but were jailbroken b4 u did it, and saved ur shsh, then u can downgrade via tiny umbrella, or changing ur computers host file
Now, if u r wondering wut a shsh is, In short, it is ur devices specific signature that apple uses to authenticate ur device when u r contacting them via iTunes
If u dnt known if u saved it or not this is how you can tell: when u first got cydia, and opened it, in the upper left hand corner it said"make ur life easier" or something to that effect. If u clicked it, then ur shsh blob was saved.
Or u may have saved it locally via tiny umbrella
Eithier way u would be in the clear
But for those new iPad users who got their machines shIpped with 3.2.1
And
The users who have upgraded without shsh saved, u have to wait until the next jb comes out( there is nooooooo waybaround this) period
Any questions feel free to ask me