I have tried that. Once I get to a progress meter on the iPad, Redsn0w tells me that it cannot close a compressed (IPSW) file and quits.
Help Ipad 2 previously jail broken tried to update and now stuck in the middle. When I try to restore I get either unknown error 36 or 6. Have tried about 10 times and no luck.
Yes have followed the steps multiple times. I was getting a few of the most common errors but have since solved those problems just always end up with a error 6 or 36 at the end of the restore cycle.
FYI, took it to the genius bar yesterday, they thought it might be hardware related and offered me a trade in. Guess that might be my best option
If you follow every step of the tutorial, without modifying a single step in any way, you should not be getting these errors.
An error 6 or 36 often points to something on your PC not playing nice. As sci-fan said, anti-virus etc. needs to be turned off. Be as agressive as you can. i.e quit every task you can possibly quit on your PC before trying it again.