[youtube]http://www.youtube.com/watch?v=flLxLGHnlnw[/youtube]
Last week I announced that blacksn0w was modified to work on iOS 4.0 GM, but at that time the porting was not 100% functional because after each restart it was necessary to reimplement the blacksn0w patch. Here, the people from pushfix.info worked on the modification of blacksn0w and for a few days there is blacksn0w RC2 which is 100% compatible with iOS 4.0 GM and does not require reapplying after every restart.
This version of blacksn0w works EXCLUSIVE with baseband 05.11.07 on any device, so if you have this baseband, you want to test iOS 4.0 GM and you are willing to switch to iOS 4.0 GM using a custom ipsw then you also have to deal with decoding.
blacksn0w RC2 can be downloaded from Cydia from the repo: http://cydia.pushfix.info.
Here is the description made by the developer:
Use on Modem Firmware 05.11.07 ONLY!
V1.2: Support for 4.0 GM. Backwards compatible to 3.1.2/3 as well. V1.1: MyWi tethering fixed
Geohot's unlock for 3.1.2/3.1.3/4.0GM on the iPhone 3GS (and probably 3G). Please donate at http://blackra1n.com/ if you enjoy.
With 3.1.3 & 4.0 GM patch (when needed) by msft.guy. Packaged by Pushfix.info
This is an unofficial release but Geohot HAS given me permission to redistribute blacksn0w. All known issues with WiFi loss and boot loops seem to be fixed. If it doesn't work for some reason, you should still get the SpringBoard. This allows you to uninstall if necessary. It is a little slower to boot because of the increased safety of the release. A 3GS boots to cell connection established in about 90 seconds in iOS 4 now (50% slower than 3.1.X).
Improvements may be made in the future.
