If you try to downgrade a new Samsung phone to an older firmware using Odin you are gonna get
SW REV. CHECK FAIL. Fortunately, there’s a fix for this but it takes a little bit of patience
Ap_<Version>.tar.md5 content in the same place as the required tools.
.lz4 files to
.img by dragging and dropping them on
lz4 files and tools to tar with 7-Zip
Ap_<Version>.tar.md5) and flash normally using Odin
If needed place vb_mate.img in AP slot to disable AVB