Step 1: Make sure you have a US Apple ID ready
If you don't have an non-mainland Apple ID, you can try to get it in the following ways:
Method 1: register by yourself (reliable and secure)
Learn how to register
Method 2: purchase via Taobao (convenient and fast)
Learn how to buy
Step 2: Download TestFlight from the App Store.
Click here to download TestFlight APP
Please return to this page after installing TestFlight.
Step 3: Download the MUFEX App in TestFlight.
Download MUFEX APP Here
Step 4: Select Install.