since my new phone is pretty new, there are no real custom ROMs available at the moment.
I'd stick to LineageOS, but i prefer to stay with stock rom when xposed would be able to run on my Mix 2
-> root first
-> flash zip file with framework
-> install apk
-> add wanted modules
Okay, root seems to be a bit complicated now since there might be a TWRP image, but this is only available in some russian forums, where the registration gets a bit difficult with the captcha
But when rooted, what to flash next? arm or arm64?
The Oukitel Mix 2 has a Helio P20 (en.wikichip.org/wiki/mediatek/helio/mt6757) which is ARMv8 which can run 64Bit.