Error 1604 when loading custom fw
First of all, I'm not really sure what BootROM I have because all of the guides I have seen say to refer to "Device Instance Path" in Device Manager, but I have no such field in the details.
Secondly, what I'm trying to do is the load 3.1.2 factory settings, jailbreak, load custom 3.1.2, jailbreak method. When I try to load the custom fw there is an error 1604. I have loaded this custom fw on another older 3GS with no problem.
Is it possible that the custom fw is not compatible with a newer bootrom?
Thanks for any help provided