Master reset co hai cach:
c1: lap sim
c2:thao sim ,khoi dong may
^*vv*v*(^:lan nut ROLL len.V:lan nut ROLL xuong)
hien ra menu,chon dong thu 3,sau do chon fomat va lam theo yeu cau tren man hinh.
note: fomat theo cach nay se mat het du lieu ke tieng viet.
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