only working files this time plz and a info of how to do, have 1, 16 gb sd card and wanna update with "all in one usb" way.

i have this gps : ng4_D_R26b_R26-04

what i need is
"all in one use" download
firmwire update, idk what i have today.
and ofc the gps update files.

i have done a factory reset to hope that the other file i was givven would work but not, so i hope i get the right files this time
plz help me !!!!