I managed to download the latest USA firmware using Frija. I reuploaded the zip here, untouched: https://drive.google.com/file/d/1vi9ldpWH2Z0R9E3ojGNLGmy6vIxM18I1/view?usp=sharingBuild versionCode:F968U1UES2AZB6/F968U1OYM2AZB6/F968U1UES2AZB6Those interested can try converting their "B", "0" or "N" models to U1 using this and modified ODIN.