You said you had a A unit, which, when upgraded via FW will read as a version D.
Whatever the unit believes it is, it is STILL an A unit. I have an A unit and cannot go higher than 3810. Have tried 3970, 4020 using a gazillion different burning methods. Ba-bow. No dice.
Trust me...3810/V5 maps/Personal Poi's and personal Splash Screen is more bling than you need. 4020 is not giving you any more bang for buck.
Whatever the unit believes it is, it is STILL an A unit. I have an A unit and cannot go higher than 3810. Have tried 3970, 4020 using a gazillion different burning methods. Ba-bow. No dice.
Trust me...3810/V5 maps/Personal Poi's and personal Splash Screen is more bling than you need. 4020 is not giving you any more bang for buck.
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