M3 MediaPad UK root help

[purpse]

Please could someone post a simple step by step guide to root my new M3. I have rooted many nexus devices, but the huawei seems much more complicated.
BTV-W09C100B007
EMUI 4.1.3
UK version. No update to 7/EMUI 5 available..

 

[purpse]

Ok. Upgraded to emui 5 with firmware finder. Is 5th May the very latest security update or should i try a different rom. There were many options with same build number and I would like the latest.