Legal analysis: As long as the content of the guarantee letter does not violate laws and regulations and meets the requirements, the signature and fingerprint are legally valid.

Legal basis: "People's Republic of China and Civil Code"

Article 464: Definition of contract and legal application of identity relationship agreement A contract is between civil parties Agreements for establishing, changing, and terminating civil legal relationships.

Article 490, Paragraph 1: If the parties conclude a contract in the form of a contract, the contract shall be established when both parties sign, seal or fingerprint.