I am aware that garmin xt will run on various wince 6 devices but more recently I purchased a device running on an A8 dual core processor and have not been able to get any of the various garmin softwares to run on this device. RAM = 512MB FLASH = 4096MB.

Can anybody assist?

... a8 dual core processor is hardware... windows ce 6 is software.. u are messed up. Anyway i am newbie here and searching for answersmyself too. but thers prolly 3 places here u might get your **** working.
http://www.navitotal.com/showthread.php?7763-Garmin-XT-5-52-(Garmin-Asus-M10)-for-WINCE-6-(800x480)&highlight=garmin+windows+sirf
or the other one by
http://www.navitotal.com/showthread.php?2329-Garmin-Mobile-XT-CE-for-Chinanavi-with-800x480
the third one by a poster thats banned, and i think his links are no longer working so nvm

Some INfo
http://www.navitotal.com/showthread.php?4614-About-Garmin-maps-Additions-files-(gmap3d-JCV-gmaptz-ASR-G2S)
and maps ofc from http://www.navitotal.com/forumdisplay.php?88-New-Maps