Unlocking method and system for air conditioner unit

An unlock method for an air-conditioning unit, comprising:

• S1:
• a control apparatus generating a dynamic graphic based on at least an identification code and an update code and presenting the dynamic graphic on a display apparatus, and generating an unlock password based on a certificate, the identification code and the update code, wherein the update code is regenerated to change the dynamic graphic;
• S2:
• a user terminal device acquiring the dynamic graphic and sending the dynamic graphic to a server;
• S3:
• the server decoding the dynamic graphic to obtain at least the identification code and the update code;
• S4:
• the server obtaining an unlock password according to the certificate, the identification code and the update code;
• S5:
• the server sending the unlock password to the user terminal device;
• S6:
• the user terminal device displaying the unlock password;
• S7:
• inputting the unlock password through an input device;
• and
• S8:
• the control apparatus comparing the generated unlock password with the input unlock password to judge whether to grant a corresponding permission.