em da flash len w800 gio lam theo bai cua bac K750 de mod cai loa va camera nhung khi toi far manager thi bam ALT +F1 chon SEPF thi no hien ra ban mau do bao loi "plug in call error" "exception occurred" rui bam ok thi no hien ra bang mau do khac rui mat vay em phai lam the nao?sao em thay khi rut cap ra khoi dt thi no cung the.khi thuc hien buoc 2 co mo nguon hay gan sim gi ko?