As has been mentioned many times already. Download blackra1n here: blackweatherQuote:
Plug iPad in turn on iTunes. Click make it rain. Your iPad will go into restore mode. Close blackra1n. Click restore. It will tell you 3.2.2 is available. Restore. If it gets stuck at the end of the restore run blackra1n again and make it rain to unlock it. Again kill blackra1n after running it. (you aren't using it to jailbreak.).
Once you are back to 3.2.2 you will have to activate again, best to just restore your profile now.
Once you are back to everything working how you want it and everything is on your iPad opt-click (for mac, shift click for windows) the check for updates button. It will bring up the selection dialog. Select the 4.2 beta 2 restore. It will update if it gets stuck again use blackra1n to resume update. When it comes back you will be in 4.2 with everything intact.
when i start blackrain i get a message: asl.dll is missing.. im on win7.. can some1 help?