xiaomi mi max

Hallo, for half a year i bough the mi max 3 and now it dont starts anymore the mi logo show up and and it crashed i remeber the last what it shows was "miui cant install". I was allready in an phone repair shop but they cant help me they mean somethink is with the motherboard. I had try myself...

Hello everyone, I recently bought a Xiaomi Mi Max Prime (4RAM/128ROM) wich comes with official stable China ROM based on Android 6. I want to install the Developer version offered by Xiaomi.eu, which has MIUI 8 with Android 7.0. So, should I flash TWRP_helium or TWRP_helium_7.0 considering the...