All Mstar CPU 8533C 8533 8533F headphone solution
By helpful-man 1st connect 1 ware with battary+, then on handset with power supply.
2nd touch battary+ ware with headphone or usb port connections one by one
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a
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and
follow with display, that's is final solution for headphone when headphone icon is removed.
3rd now just connect battary+ ware where touched by battary+ connection.
100% tested by me