Where to get the files in the heimdall tutorial: factory.rfs, cache.rfs, etc?

Thanks, aidb.
From samfw I downloaded a zip file with 4 .tar.md5 files
A thread from a different topic gave me the hint that I should rename the one starting with CSC_…md5 to CSC…zip
Then, inside the zip file, I found files such as cache.img.lza, omr.img.lz4… but not the files mentioned in the heimdall tutorial, and not a single, clear zip file like the one for elementary, that I can install with twrp.
I successfully installed twrp using heimdall, then elementary using twrp, but I can’t install the stock rom, in order to be able to reinstall again, and debug an issue with /e/ 3.0.1