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This article will help you when you see error 1015 on 2012 iPhone 3g.
This error is usually caused primarily by attempts to downgrade software from Apple’s iPhone, iPad, or iPod touch. This can certainly happen when trying to upload an old file. ipsw directory. Downgrading is probably not supported.
Custom Firmware for iPhone 3G 4.2.1 (Google Search) Currently I am currently working on a previous firmware, often because websites have been shut down.