We have got hold of official touchwiz android 6 Marshmallow ROM for the Samsung Galaxy S5 Mini that is deodexed, rooted and de-knoxed. This ROM is exactly the same as the one that was pushed by Samsung but the only difference is that it has been rooted so there is no need of rooting it again. The only requirement to flash it is that you need to have Galaxy S5 Mini TWRP installed and second, it works only on the G800F variant of the android phone.
Here are the installation instructions for installing the Samsung Galaxy S5 Mini Android Marshmallow 6 Pre rooted, deodexed, de-knoxed ROM.
2 Boot to recovery and wipe everything – internal storage isn’t necessary, but it is always recommended to start a 100% clean installation
3 Boot to Download mode and flash original firmware using ODIN
4 Let it boot, configure your things, etc and then go back to download mode
5 Flash latest TWRP recovery – don’t let the phone boot. Press volume up + home + power until “recovery is not seandroid enforcing” message pops up as soon as ODIN finishes the flashing process
6 Press install and select this mod.