Default Flash rom 4.0.4 for my razr xt910

i am a new member at tis forum and this is my first message here

i have RAZR XT910, android ver. 4.0.4 at system ver:

I know that this is very old version but i want to flash another 4.0.4 version again, i don't need upper version.
The phone is going slowly and get stucked so i want to flash another 4.0.4 again.
I have root at this phone if it's matters.

Can you help me how to do it, or send me links to the specified ROM.
I already have the RSD LITE tool but never did it before alone
Thank you very much!