How do I update Galaxy S4 mini to Lollipop 5.1?

[Francezu2015]

Hello guys. I have an s4 mini, model GT-I9195 with android Kitkat 4.4.4, and I want to install cyanogenmod 12 with android 5.1. When I try to install some custom recovery like twrp or Cwm with Odin, I get an error message like: "could not do normal boot". I ve try to root my phone but I have same result. Have someone idea what can I do? I ve tried all known possibilities but every time have same negative result. It s possible to make some boot unlocker?

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