did you manage to get this problem resolved ?
got what sounds like exactly the same problem
no matter what method i try to restore with I always end up with this damn error 6 and no boot just back to dfu or wtf mode !!
tried everything i can think of to get past this but no luck !
tried different cables,different ports,different computer with fresh install of windows 7,redsnow (usually ends up with usb com error unless i use older versions),snowbreeze custom fw,ireb,tiny umbrella even tried irecovery !
done with custom fw's and official fw 3.1.3,4.2.1
the custom fw almost completes before fail and the official gets to about 2 3rds before fail?
this error 6 i plaguing me every time !!
it even jailbrakes with redsnow but dosnt reboot just goes back to dfu or wtf with black screen and ive never even seen the connect to itunes on the screen it just stays black!
so if you found a way round this error please let me know,it would be a huge help to me
dont care which fw version its running just want the damn thing to turn on i'm determined this thing wont beat me!
any help or pointers in the right direction would be much appreciated