1. Not sure what bootloader the XXL has but if it's lower than 5.5120 then you need to firstly update the bootloader see note #4 here
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so it can read SDHC cards.
2. Did you copy an older mapsettings.cfg file from a previous map into the new truck map folder? if so try deleting it.

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3. Remember you need the truck navcore 8.398 & truck map and your old ttgo.bif (from internal memory) on your 4Gb card and THEN you should be able to crack/activate the map on the card using FastActivate Premium (or other tools like Easytools, Bobbys etc)