Georze Hotz aka GeoHot left an important message on his twitter account, blackra1n isn’t compatible with firmware 3.1.3 and blacksn0w isn’t compatible with baseband 05.12.01 at the moment. GeoHot also stated that the untethered Jailbreak is not possible and he don’t know if it will exist when they exist. In simple words there is no ETA on an unlock for Baseband 05.12.01. It is likely that dev team, geohot will not waste another hole on 3.1.3. They will most likely hold it for the bigger update that will come with the release of the iPad and iPhone 4.0.
iPhone 3G owner with bootloader 5.08 : iPhone 3G with 05.08 (5.8) Bootloader from the factory can downgrade their baseband with FuzzyBand. This is a very limited number of phones that were released in the first few weeks of the 3G production cycle. Downgrade iPhone 3G 3.1.3 Baseband 05.12.01 With Fuzzyband
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