Solution:
Simulator link:
https://awsde0-fusion.fds.api.xiaomi.com/global-tv-setting/index.html#/preference
Once the simulator is open, the following process is carried out:
1.- Go to the settings bar
2.- Select device preferences
3.- Clicking on restart / reset or recover can come with different synonyms depending on the region or model of the device, normally it comes as the last option of device preferences
If you do not have the menu, you can perform the following process:
1.- First, the device to be reset is disconnected from the light
2.- Press the BACK button and the CONFIRM key at the same time
3.- Plug Mi Box S TV 4K back to electricity, hold down both buttons.
4.- After a while, you should see a recovery mode screen, choose Wipe data / Factory reset.
5.- Confirm everything by selecting Factory reset.