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Apple released the iPhone Software update OS 3.1.3, the latest firmware update contains a baseband firmware update 05.12.01 like firmware 3.1 and it’s is not compatible with Ultrasn0w. Means if you upgrade your iPhone 3G/3GS for OS 3.1.2 to 3.1.3 your baseband will also upgrade from Modem FW 04.26.08 or 5.11.04 to 05.12.01, For more details about Baseband and Bootloader check here iPhone Baseband and Bootloader From Basic. Dev-team released the updated version of pwnage tool. With pwnage tool you can jailbreak and preserve your current baseband so you can enjoy the carrier unlock on latest 3.1.3 firmware.[...]
Apple released the iPhone Software update OS 3.1.3, the latest firmware update contains a baseband firmware update 05.12.01 like firmware 3.1 and it’s is not compatible with Ultrasn0w. Means if you upgrade your iPhone 3G/3GS for OS 3.1.2 to 3.1.3 your baseband also upgrades from Modem FW 04.26.08 or 5.11.04 to 05.12.01. Sn0wbreeze team released the updated version of Sn0wbreeze aka pwnage tool for windows. With Sn0wbreeze you can jailbreak and preserve your current baseband so you can enjoy the carrier unlock on latest 3.1.3 firmware.
AkA Jailbreak the iPod Touch 1G, 2G and iPhone 2G, 3G, and 3G[S](old bootrom & non MC).[...]
Sn0wbreeze 3.1.3 has been released which can jailbreak iPhone 2G, 3G and iPhone 3GS on the latest iPhone 3.1.3 firmware. One thing which is to be noted here is that it will work with iPhone 3GS only if it has the older bootrom (non-MC model). iPhone 3GS users who have upgraded to the stock 3.1.3 are still out of luck.[...]
Okay, so we already knew iPhone OS 3.1.3 would be trouble thanks to the ModMyi team. Already we have seen an update to RedSn0w which allowed iPhone 2G users to jailbreak there iPhone using a loophole. The dev team says it is for experimental purposes until a full jailbreak is released.
BigBoss is reporting that Apple has stopped signing the iPhone OS 3.1.2 firmware, meaning that you can no longer use iTunes to install a custom firmware of 3.1.2. This also means that if your on 3.1.3 you cannot downgrade, but if you’ve been following along, you should know that already.YOU CANNOT DOWNGRADE! If you’ve saved your SHSH’s on Cydia or Rock, you may be in luck for downgrading, but its not guaranteed to even work.[...]