You can't because A1 don't support mhl, as far as I know it required the phone to have usb 3.1 to support usb c to vga/hdmi output. But you can use chormecast if you want to use wireless method.
xiaomi released kernel source for mi max 2 after six months, so I guess they will release kernel source for our device after that same amount of time
You can do it without rooting your device, Go to Developer options and untick Automatic system updates.
A user in G+ posted some Screenshots
its says 404 error
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,I really need it ,
Sorry, Link updated.