Replace the system language to English (after replacement, it is best to log out and restart a bit), then open the AppStore, if there is no problem, then switch back to Chinese.
Tap into Settings - General - Restore - Restore Network Settings in turn.
First, log out of the AppStore completely, go to Settings to log out of your AppStore account, and then log back into your account and enter the AppStore to get the update.
Tap into Settings-iTunesStore and AppStore in turn-tap AppleID (your current ID number)-View AppleID-Change Country or Region.