How to do if Mi Robot Vacuum appears internal error?

The internal error indicates that the host has detected the error and cannot continue to operate. First, turn on Mi Robot Vacuum and follow the next steps:

1.Put the main engine flat on the ground, press the fuselage with both hands and push it forward and backward on the ground to ensure normal rotation of the main wheels on both sides,

2.Rotate the main brush forward and backward repeatedly by hand to make sure that the main brush rotates normally,

3.Connect the mobile phone and upgrade the firmware to the latest version,

4.Restore the original version.