SM-G975F_1_20201028025634_p90n1mn4i0_fac which i downloaded from frija
yes i used the patched version
SM-G975F_1_20200829062233_jjf89sulm2_fac which i downloaded today and is a previous version of the update but was of no luck
Sounds like you have an unsigned img in your copy you're trying to flash via Odin. Try finding a different version of the software.
i tried a different firmware and that got stuck too