Greetings ppl

Im trying to install igo8 on my rather old sony nv-u71t, and found the nice guide in here.
But i hit a few problems i seek a solution to.

Problem 1. When i copy files to my U71T, theres not enough space on it, i imagine its the 1.7g European map that takes up all the space.

Then i got the bright idea, to delete allmost all on it, and ofc wanted to backup everything on the unit first.

Problem 2. When i try to copy the huge map file on it, after something like 30 mins (takes 2 houres to copy it says), it looses connection to the unit, and i have to reboot the unit before i can see it on my computer again.

Anyone got any suggestions ?