as far as i know there is no 2705, only 2706, 08, 10 and 12 in the 27 series, i think it will say 2706 but some of it has been rubbed off, so yes, those will be the ones too use
FAT 32 for the files syetm and when you download any files there wil be several folder called APPDATA, SYSTEM etc, just copy them all to the firmware partition, safely disconnect and see what happens, i have the same player as you and my firmware is up there somewhere, i have bricked the player so many times, in fact it bricks on a daily basis!!! - i dont use i now
