If you are encountering an error code 521 while using the Google Play Store, it typically indicates a communication issue between your device and the Google Play servers. Here are some steps you can try to resolve this error:
Check your internet connection: Ensure that you have a stable and reliable internet connection. You can try connecting to a different Wi-Fi network or switch to mobile data to see if the issue persists.
Clear cache and data: Go to the Settings of your device, then navigate to the Apps or Applications section. Locate Google Play Store and Google Play Services, and clear their cache and data. Restart your device and try accessing the Play Store again.
Check for system updates: Make sure that your device's operating system is up to date. Outdated system software can sometimes cause compatibility issues. Go to the Settings of your device, look for the System or Software Update option, and check for any available updates.
Disable VPN or proxy: If you're using a virtual private network (VPN) or proxy server on your device, try disabling it temporarily. Some VPNs or proxies can interfere with the communication between your device and the Play Store servers.
Remove and re-add Google account: Go to the Settings of your device, then navigate to the Accounts section. Remove your Google account associated with the Play Store, restart your device, and add the account back again. This may help refresh the connection to the Play Store servers.
Factory reset (last resort): If all else fails, you can consider performing a factory reset on your device. This will erase all data and settings, so make sure to back up your important information beforehand. After the reset, set up your device again and try accessing the Play Store.
If the error code 521 persists despite trying these steps, it may be helpful to contact Google Play support directly. They can provide more specific assistance and troubleshooting steps for your particular situation.