Use the lightning cable charger that came with your iPhone or iPad to connect it to your Windows computer or Mac. The easiest way to bypass parental controls on a mobile device is to perform a factory reset. Factory resetting your phone will not work if parental controls are set on your router. If this is the case, use a VPN or Proxy site. If you are using Windows or an older version of macOS, open iTunes. It has an icon that resembles a music note. If you are using macOS Catalina or newer, open the Finder instead. In iTunes, it's the icon that resembles an iPhone or iPad in the upper-left corner. In the Finder, your iPhone or iPad name is listed in the side panel to the left. Both the Finder and iTunes give you the option to backup your iPhone or iPad to iCloud or to your computer. Click the radio option to backup your iPhone or iPad to your computer. This begins the process of backing up your iPhone or iPad. Wait until the backup is complete. It's below your device name at the top of the screen. This displays the Terms and Conditions. It's in the lower-right corner. This indicates that you agree to the terms and conditions. To finish restoring your iPhone or iPad, unlock it and then enter the email address and password associated with your Apple ID.

TL;DR in Vietnamese:
Kết nối iPhone hoặc iPad với máy tính. Mở iTunes hoặc Finder. Nhấp vào iPhone hoặc iPad. Nhấp vào tùy chọn sao lưu iPhone hoặc iPad vào máy tính. Nhấp vào Back Up Now (Sao lưu ngay bây giờ). Nhấp vào Restore iPhone/iPad (Khôi phục iPhone/iPad). Nhấp vào Next (Tiếp theo). Nhấp vào Agree (Đồng ý) ở góc dưới bên phải. Mở khóa điện thoại và đăng nhập.