Install below version failed with Magisk 17.1, error mount /vendor related
https://sourceforge.net/projects/team-reloaded/files/santoni/DirtyUnicorns/Special%20Edition/du_santoni-v12.5-20180831-2048-UNOFFICIAL.zip/download
Installation of below versions + Magisk are fine
https://sourceforge.net/projects/team-reloaded/files/santoni/DirtyUnicorns/Final/du_santoni-v12.5-20180810-1351-UNOFFICIAL.zip/download
https://sourceforge.net/projects/team-reloaded/files/santoni/DirtyUnicorns/du_santoni-v12.4-20180718-0849-UNOFFICIAL.zip/download
Uses latest TWRP 3.2.3 santoni, before install already flash latest redmi 4x firmware santoni_global_V9.6.4.0.NAMMIFD_20180726.0000.00_7.1_global_2b66115cda
and use TWRP to format data to wipe all data and encryptions
Flash treble,non-treble rom related issue, please close ticket
https://forum.xda-developers.com/xiaomi-redmi-4x/development/unofficial-redwolf-recovery-t3776738