This situation is very complicated and involves privacy and legal issues. In general: 1. If the other party deletes the message in the chat software, and neither party has enabled or retained a backup, most mainstream chat software (such as WeChat, QQ, WhatsApp, etc.) usually do not retain data for recovery on the server side for privacy protection and security reasons; and the data on your device may also be encrypted or overwritten, making recovery very difficult. 2. There are indeed some so-called data recovery software on the market (such as Dr.Fone, EaseUS MobiSaver, etc.), which are mainly aimed at recovering local data on the device (such as accidentally deleted text messages, photos or other files). However, whether it can recover chat records depends not only on whether the data on your device is overwritten, but also on the data storage and encryption mechanism of the chat software. If the message was originally stored only on the other party's device or chat server, then these software are usually powerless. 3. More importantly: If you try to recover messages deleted by the other party, it may involve infringing on the privacy of others or violating relevant terms of use, and even touching on legal issues. Whether it is technical means or recovering data through third-party software, you need to be very cautious and ensure compliance with laws and regulations and the regulations of relevant platforms. In summary, there is no simple, universal and legal tool on the market that can ensure the recovery of chat records deleted by friends without backup. It is recommended that you treat such requests with caution and respect the other party's privacy. At the same time, if you think that the loss of important information has an impact, you can also communicate directly with the other party to see if you can find the records or reach a consensus in other ways.