Can't restore to update from 4.0.1
I have an iPhone 4 with 4.0.1 jailbroken and unlocked for regular travels abroad.
Recently, I've decided to upgrade to a newer version, last I tried it was 4.3.3 that I could keep an unlock and upgrade. I want to upgrade to allow syncing again, which I had lost some time ago. I haven't been able to sync for at least 6 mos, so new music, etc. not getting over. ( I get a 13019 error when trying) This means also that I am not getting backed up unless I do so manually using iphone explorer, which is a real pain.
Anyway, when I go to restore after building a custom ISPW using Pwnage tool 4.3.3 I get error codes such as this one: "the iPhone "xxx" could not be restored. An unknown error occurred (1600)." I also got the 21 error. Both of which I have followed instructions to fix repeatedly.
I'm in a loop... any suggestions?