How to enter the mode for testing the functionality of various hardware parts (Engineering Mode)
** Each mode of this machine may be different from the picture.
Can access in 2 ways
Method 1 Enter the call app Press * # * # 6484 # * # *
Method 2 Enter the Settings About Phone app Find the Kernel Version line. Then click on this line 5 times.
If it is useful to you who want to check the machine work
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