Good day! I also have the error 23 problem with my iphone 2g. Initially the phone was stuck in the emergency call mode showing "restore needed" and the imei is unknown. So, I tried to restore it to 3.1.3 however, at the end of the process it showed an error 1012. The next thing I did was use redsnow and put 3.1.2 in it, checked install cydus and unlock however when the process came to the moment where bootneuter is detecting the current settings it hanged, I restarted it and now it is stuck in the apple logo. Here is the recent log file of the update

http://pastie.org/1592903

any help would be greatly appreciated. Thanks!

The problem is slightly different for the 2G iPhone, so I moved your post out of the 3G/3GS thread.

Basically, this is a hardware error - however on the 2G iPhone, it's possible to fix this by replacing only the Commboard. I recommend you investigate this.