You have the latest maps below 2015/2016 :
[Only registered and activated users can see links. ]
Good news, you have the latest firmware dated.
Try with .iso CD image GB/IE 2015/2016, burned slowly like a CD image (526 Mo) on CD-R Verbatim.
I burned France and Spain/Portugal with success for a friend, they work very well on RT3 407 coupe.
CD burned all the time with UltraISO Premium, never error with .iso CD or DVD Verbatim.