Having trouble installing TWRP, D855 // 6.0 (v30c-EUR)

Full info 1st:

D855
Android 6.0
Kernel 3.4.0
Build MRA58K
V30c-EUR-XX

Installed this OFW via KDZ method

My goal: install fulmics 5.1


So, using Kingroot for temproot here.

Tried to use TWRP-Manager, installing latest TWRP - failed.
Using flashify, nope -> red/blue LED
Using terminal emu (su, dd if=/ etc etc), nope
Using terminal emu after the whole writing the replacement recovery and typing, without quotes "reboot recovery", nope -> red/blue
Using recoverymode, results into the original.

So, what am I missing? :)