3gs old bootroom upgraded to 4.0 problem
i got a 3gs with bootrom 359.3
until today it runs 3.1.2 unlocked perfectly.
trying to install 4.0 i did this:
- upgraded via itunes 9.2 to a 4.0 original firmware downloaded 4 days ago
- made custom firmware with pwange tool
- when i try to restore with the custom 4.0 firmware itunes says error 1600 (both recovery mode and dfu mode)
i didnt save the ecid/shsh stuff (i dont know much about this issue) can i use another iphone´s ecid to downgrade?
what did i do wrong?
thanks in advance