Flashing back to orignal firmware 1.5 israel hel plz

[i love metal]

ok so my warenty is about to expire on my galaxy I7500 and i would like to use it to try and get a new galaxy S from orange.
my phone is now runing 1.6 galaxo and i would like to flash it back to 1.5 as i got it from orange israel.
can some one give me a link to an original w/e i need to do so.
now say i do get a link can someone walk me through the whole thing cuz i got no idea how to do so. sonmeone said i need to use odin and i have no idea how to use it so plz help me with this. also should i format the SD card?

P.s
if someone from israel sees this i would be more then happy if i could call you so you can help me.
thank you very much and plz hurry it expiers on moonday

 

[i love metal]

so i downloaded a new firmware which is the real one and i have these files:
amss
cache
kernel
recovery
system
and i have odin v3.95 what do i do now?
when i press the ops i cant find any .OPS files what should i do?

 

[i love metal]

nvm guys i maneged to do it ty very much anyways you can lock this theard

 

[srdjav]

Hey, can you provide me link with stock II5 and tell me how to go back to stock? Please