this guide?
https://rentry.org/UpdateCFW#pc-method
Since you don’t have mods hacks or cheats, simply rename your /atmosphere directory to /atmosphere.bk and your /bootloader directory to /bootloader.bk and go back and unzip atmosphere and hekate zip files at the top of your SDCard and then continue with the guide.
e: Be sure you don’t skip fusee.bin step
e2: you might want to consider mounting the SDCard using Hekate UMS rather than Tinfoil.
e3: see
@impeeza important note below about hekate_ipl.ini