1 years plus use korah.phone er shob kisu othentic. ekta problem ase like full volume dileh phone restart dey one ui version 8.5 deare por theke. ami Samsung er costomer care e niyeh gesi bolloh porer update e thik hoteh pareh. back shall just open korah hoise and abr lagay dise. phone er shob original. just open korah dekhe dam reduce koreh disi.