If you have a jailbroken & Unlocked device or if you plan to jailbreak your device do not update to iOS 4.1. Also iOS 4.1 has a baseband update you could loose your unlock forever.
Thanks
DJRaz55
For the latest updates follow@DJRaz55 on Twitter.
iPhone4 baseband isn't updated in 4.0.2, but ultrasn0w requires JB. 4.0.1 SHSH blobs will protect you from "oops" update
Thanks
DJRaz55
For the latest updates follow@DJRaz55 on Twitter.
ultrasn0w upgraded to version 1.1-1 they tweaked a few things that may help with standby battery life, you can upgrade via
Cydia.
Every time you update ultrasn0w (or Signal), CommCenter must restart. Restarting works in most cases but sometimes you need to reboot.
Thanks
DJRaz55
For the latest updates follow@DJRaz55 on Twitter.
ultrasn0w now supports the iPhone4!
Version 1.0-1 of ultrasn0w works for:
iPhone4 baseband 01.59
3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04
(If ultrasn0w doesn’t show when you search Cydia, add the repo: repo666.ultrasn0w.com)
Enjoy!
Thanks
DJRaz55

