[Solution] Error 6. Upgrading to 2.1 Custom Firmware
Notice: This solution only works for EDGE iphones (At least its where I tried it) and its the error 6 when trying to Restore to 2.1 Custom Firmware
Solutions can be the partition size too.
Let it be more than 700 Mb.
But if thats not your solution.
This is the one MickieF told me.
Restore iPhone to 2.1 Original Firmware.
Uninstall iTunes 8
Uninstall Apple Mobile Device Support.
Restore to 1.1.4
Kick out of recovery Mode.
Pwned ur iPhone with 1.1.4
Go back to iTunes 8
and Restore to custom firmware
in Restore Mode.
Credits for him.
Hope it helps u.
Hernan Sananes - lamanodedios