I don't know why, but I tried repeatedly to get 4.2 on my iPad and got an unknown error every time...after unfreezing the thing because I tried restore the first time.
Best I could do was revert to 3.2.2 and pray that 4.2 will work for me when it is finally released.
No idea why I couldn't option-upgrade.
Hi George let me try to help you … do exactly like i say please and let see if that work OK
first restart you computer and ipad ( i don’t know if you are in Mac or PC)
when both are restart.
plug your iPad in your computer
1) press shift (PC) or option (mac)
2) maintain the key pressed and them press
update in itunes you will see a window open and them localize your firmware 4.2 and let iTunes do the job for you , normally that should work fine … if not find RecBoot 1.0.2 in Google download the one you need (PC or MAC) and when your iPad show the itunes symbol and the error message start redBoot exit and enjoy your device in 4.2 beta 2
PS: this tool also work for downgrade
I hope that help and work for you