Downgrading from ICS to GB "Error 155"

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http://forum.xda-developers.com – i wanna downgrade my phone to Gingerbread again because after installing the official ICS i faced this problem http://forum.xda-developers.com/show...9#post31103189 so i want to get back now to Gingerbread again i have the official RUU of the Gingerbread and the bootloader is RELOCKED but when i run the RUU everything's okay till it comes to "Restarting to bootloader" step i got the error 155! knowing that i used this RUU before to also downgrade when i used "Fallout Evolution" rom so what's the problem? Thans in advance :) (HowTos)