I need help on how to put flash menus to w580

I have a w580. I didn't bought it from SE directly so does that mean that I don't need to flash my fone or debrand it?

And i'm using CID53?

i tried using the far manager and when i jumped to the rabbit hole and clicked the olof? a message appears that says " time exceeded" bla bla bla.. do i still need to flash my phone?

You don't need to flash your phone in order to put flash menus. Read here:
Put flash menus on your phone - only flash supported phones - Top Sony Forums
Download XS++3.1 and identify your phone: if it's CID52 you can use XS++ to put flash menus; if it's CID53 you must use FAR+JDFlasher.