The Chinese version of Ouyi Exchange app can be downloaded through the following steps: 1. iOS users search for "Ouyi Exchange" on the App Store and install it; 2. Android users search for "Ouyi Exchange" on Google Play or other application markets and install it; 3. You can also download it through Ouyi official website. After downloading, users can enjoy the advantages of convenient transactions, real-time data, multilingual support and high security.

The official Binance app can be downloaded from Android and iOS devices. Android users need to visit Binance official website to download the apk file and install it; iOS users can search and download it in the App Store. After downloading, users can log in to the app through their email or mobile phone number.

To solve the problem that the app cannot be installed after the iOS system is updated, you can use the following steps: 1. Clean the system cache: Go to "Settings" > "General" > "IPhone Storage", uninstall infrequently used apps and restart the device. 2. Solve through downgrade: Download the previous version of iOS firmware and use iTunes or Finder to downgrade. 3. Contact Apple customer service: provide serial number, seek professional help and backup data.

If the iPhone cannot be turned on, you can solve the following methods: 1. Forced restart: For iPhone 8 and later models, quickly press and release the volume up key, then quickly press and release the volume down key, and finally press and hold the side button until you see the Apple logo. 2. Check the battery level: Connect the phone to the charger for at least 15 minutes, and then try to turn it on. 3. Contact Apple customer service or go to Apple's authorized service center for repairs. 4. Use recovery mode: Connect your computer, use iTunes or Finder, press and hold the side button until the logo connected to iTunes appears, and select "Recover". 5. Check for physical damage: Check for cracks, depressions or other damage to the phone. If so, it is recommended to go to the maintenance center for treatment as soon as possible.

If your iPhone cannot connect to WiFi, you can solve it by restarting the device, resetting network settings, or updating the iOS system. 1. Restart the phone: Press and hold the power button, slide to shut down, and restart later. 2. Reset network settings: Go to "Settings" > "General" > "Reset", and select "Reset Network Settings". 3. Update iOS system: Go to "Settings" > "General" > "Software Update", download and install the update.

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If your iPhone is lost, you can retrieve it through the "Find My iPhone" feature. The specific operations are: 1. Visit the "Find My iPhone" website or use the "Find" app, enter the Apple ID and password to view the location of the phone; 2. If the phone is nearby, select play sound; 3. If it is not nearby, select "Lost Mode" to lock the phone and display contact information; 4. If it cannot be found, select "Erase Device" to clear the data, but the phone can no longer be located. If this function is not enabled, contact Apple customer service, report the IMEI number to the operator, and change the relevant password to protect the information security.

The reasons why Apple phones suddenly enter the restart cycle include software failures, hardware problems and system updates. The solution is: 1. Force restart: quickly press the volume up key, then press the volume down key, and finally press the side button until the Apple logo appears. 2. Recovery mode: Connect to the computer, press and hold the side button to the recovery mode screen appear. 3.DFU mode: Connect the computer, press and hold the side button and the volume down key for 10 seconds at the same time, then release the side button and continue to hold the volume down key for 10 seconds. 4. Hardware failures require you to go to the official or authorized repair center of Apple. Preventive measures include keeping the system and application updated, avoiding installation of unknown applications, and backing up data regularly.