Iphone 3G error 1015 after 4.2.1 restored ( How To )

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YouTube - Exit Recovery Mode With ONE CLICK! - Fixes 1015 iTunes Error!

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iREB-4.0.x-4.1-RC2.zip | 5.5 MB
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After some trial and error, I have managed to solve this problem, it may sound a bit ridiculous, instead of restoring to custom 4.2.1, I have restored it to 4.1 stock firmware (iPhone1,2_4.1_8B117_Restore.ipsw) and after the restore, you will still get 1015 error, but miraculously the recovery mode logo has changed if you observe properly, just ignore the error and use either recboot or iREB-4.0.x-4.1-RC2 to kick the phone out of recovery mode, the restoring bar will start again and wait until finish, you will get an Iphone with firmware 4.1 and baseband 6.15, use redsn0w to jailbreak and ultrasn0w to unlock. I have solved my Iphone 3G with this method, other models have not been tested, use this method on your own risk, hope can help those in deep misery now. Enjoy