Google play needs to be unbound. The steps to change the bound region are:

Set the marketenabler to the new region you want to bind, hang up the agent of that region throughout the process, and go to google play. Register a new account in a new region, clear play data and delete existing accounts, and add a new region account.

Enter play, click Redeem, enter a gift card from a new region (it can also be used by others), or use a credit card from this region, and then buy something free with a price of 0 and replace it with a new one. area!