There are some restrictions on Mainland China PS4s, only mainland China PSN accounts can be signed in on them, social features are limited. These can mostly be bypassed.
You need to create a US PSN account, log in on a non-mainland PS4, go to system settings and create a backup on a USB flash drive, plug that drive into the mainland PS4 and restore backup. Then you’ll get a 90% unlocked PS4.
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