Material definition disappeared on Creality Print 5.1

Hi. I’ve define a lot of materials on Creality Print 5.1, and suddendly, I don’t know if it was after a software udpate or without any reason, all that definitions are lost.
What may have happened?
Is there a way i can recover them? I’m emplyed big time adjusting those filament definitions

I’ve made previoulsy some backups .“cxprinter” files. I don’t know if they contain info I can restore about this materiales. I don’t find how to use them