you will have to get the charging pcb board and a hot glue gun to melt the black glue and to glue it place.
first remove the front grill then unscrew the front drivers also remove the 4 screws on the side casing.
next remove the 3 pin connector behind the speaker connections . then remove all 6 or 12 screws by the charging port BE CAREFUL their s a small ribbon cable that is easy to snap. then use the hot glue gun to melt the black glue or pry it off and feed it through and that is basically it your probably done.