I tried ... after all (Android M, TWRP Recovery), I installed SuperSU from ZIP (in TWRP) ... and system didn't boot any more ...
Any idea how to get root?
Nice.Enable Developer options in Settings, then in Developer options scroll down to Select USB Configuration, and choose MTP (even if it's already selected). That fixed it for me.
Getting some errors when trying to flash it from a stock 5.1.1 LMY48M
Anyone can assist? :c