My old reliable One XL-S has a good SE navcore and I update it with new maps and voices with no problems. But helping a friend that has a newer unit with lifetime maps.

Can a TT be hacked to add voices (specially official ones) while still maintain it's way of downloading it's official lifetime maps? I would not see why a new navcore would need to be installed, but if it's hacked as with an official navcore, would my friend still be able to download it's free official maps?