At last, it happened! (My fault, indeed).
I was upgrading my J5-2017 from LineageOS16 to Lineage17.1
I erased all, reinstalled an Oreo official ROM (J530FXXS5BSE3_J530FITV5BSC1_ITV) by Odin,
got developer status, installed TWRP J530F_TWRP_3.2.1.0.tar by Odin, RMM-state bypass by Corsicanu...