[Q] bootloop major problem

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http://forum.xda-developers.com – hello there i have changed my rom and now i want to go back to my stock. i tried to use pc companion to restore the phone but when i did i got a message saying that i don't have the official rom (or something like that) and that i can not restore my phone to original. so i tryed to change my rom to the stock manually. but i dont know what .ftf file should i use. i made a try with one and now the phone bootloops and i can not even go to cwm to restore it from there. please please please help me i am so lost. (HowTos)