1. Update the idle fish APP: Open the app store, search for "idle fish", see if there are any available updates, and download and install the latest version.
2. Webpage login: If the Idle Fish APP cannot be updated, or your mobile phone is not compatible with the latest version of the APP, you can try to visit the Idle Fish official website in your computer or mobile browser, and then log in through the webpage.
3. Log in with other devices: If the above methods can't solve the problem, you can try to install the latest version of the free fish APP on other mobile phones or devices, or log in through the webpage.
It should be noted that in order to ensure the security of users' accounts, the idle fish will upgrade and optimize different versions of the APP from time to time. If you don't upgrade the version for a long time, you may not be able to log in or use it. Therefore, it is recommended to keep the idle fish APP as up to date as possible to ensure its normal use.