Ans: If you ever mistakenly or accidentally delete keychain passwords from your iPhone, then follow this process to restore the keychain passwords. 1. First, you need to go to Library. 2. Now, click on the Keychains Folder. 3. There, you will find the restore option, just click on it. 4. You can select any preference files from the Preference Folder. You will find it in the Library option.