Hacking Savegame header question

[javitox5000]

Hi everyone, Ive been playing my backup of Bravely Defaul for a while in my gateway but I deleted the header before I started, now I have progressed quite a lot in the game and I wanna patch it to be able to get online with it.

My question its, there is anyway to change the header of the backup without losing my save or anyway to change the save ID to my header one?

Thanks everyone!