http://www.ihackintosh.com —
Dev team already warned don’t upgrade to 3.1.3 and wait for next version of Pwnage Tool to preserve your baseband. Upgrading to 3.1.3 with Ultrasn0w/Blacksn0w installed will cause people to lose their unlock and will be unable (for the time being) to get it back. OS 3.1.3 contains a baseband update 05.12.01 BB for iPhone 3G and 3GS. The latest Modem Firmware 05.12.01 BB is not down gradable. So if you accidentally updated your iPhone 2G, 3G or 3GS to OS 3.1 here is the handy guide for downgrading.
Remember this ...
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