From google, might work for you. Good luck.
Reset or flash the firmware directly with a PC , you will find tons of tutorials on YT. Step by step.
I used a 5v 2.4ma plug to stop it from resetting (original one is 5v 1ma) and also if they get really warm they reset consistently.
Change the power supply and cable
This seems to be a problem with power adapter to your MI stick/box. The power adapter is not able to deliver the required amount of current. If you are using USB port of TV to power up the stick/box then this problem is likely to happen as generally the TV usb port cannot deliver enough current.
Search for how to hard reset this Chinese TV model.. there is probably a sequence of buttons on your remote you need to press while it's booting..
Did you update your mi tv stick?