1. Make sure that the latest versions of Bullfrog Assistant and iTunes are installed. If your bullfrog assistant or iTunes version is older, you may not be able to use the import function. Please go to official website or app store to download the update. 2. Make sure you have allowed applications to be managed in iTunes. When connecting a device to a computer, click on the device name at the top left of the main interface of iPad/iPhone to enter the page about devices, select the Apps file in the left navigation bar, and then find and select the bullfrog assistant on the right. If you don't see it, you can close the bullfrog assistant or restart the computer and try again.

3. Ensure that the signature of the corresponding application is valid. For iOS devices that are not jailbroken, IPA files may not be installed due to application signature problems. If the IPA file you downloaded is not legally signed, you may need to download it again and make sure the source of the file is reliable. 4. Make sure that the equipment and computer are connected correctly. Sometimes, the import operation may fail because the device is not properly connected to the computer. Please reconnect the device and make sure that iTunes or other related drivers are installed correctly.

5. The IPA file may not support the current operating system/device. Some IPA files require a higher version of the operating system/device. If the current hardware or software version is lower than the requirements, the installation may fail. The above methods still can't solve the problem. You can contact the official customer service of bullfrog assistant for further consultation and help.