How to unpack a encrypted pak file

Urgent help needed!

I want to mod efootball 23 mobile (for my personal use only)…

But the file “main.307030201.jp.konami.pesam.obb” is not opening. I think it’s encrypted. I also have the encryption key. But I don’t know how to unpack it and pack it again. I only want to replace the jerseys for my personal use